What to do with old LP inner sleeve?

My policy is that if the original sleeve has any art/advertising or other data on it then it must be kept, without it the LP is not in original condition. If it's just a plain unadorned sleeve I discard it. While I've never seen anyone note the inclusion of original sleeves other than the lyric types it always seems to me best policy to do this

To quote you, " without it the LP is not in original condition".  That was my deep inner feeling.  Which is why I asked first before proceeding any further.  Thanks for your response.  

Besides which the ones advertising other LPs are period pieces in their own right, they can also help in confirming the dating of an issue as well (I recall some cases where telling a first vs subsequent pressing can only be done through matching with the inner sleeve)

If the original inner sleeve has info specific to the album I keep it. If it's just one of those so very common generic label advertisement sleeves I chuck it. I don't care about the generics, and I doubt anyone else does either.
 

Wow folkfreak.  You saved me from chucking the baby out with the wash water.  It never dawned on me that the advertising dates the period of the recording.  I just picked up off the floor an inner sleeve that has a picture of a Columbia model 632 stereophonic console phonograph as part of the advertising.  Not realizing that that advertising helps with the provenance of the recording, so to speak.  And I was about to put it into my recycling.  From this point on I'll only discard the plan sleeves.  And place the old one back in, even though it may be a bit snug.      

If it's so snug it risks damaging the outer sleeve how about putting it in the clear LP jacket that you're storing your LPs in, i.e. outside the LP sleeve -- if you use a nice well sized one like this you will have plenty of room
http://www.sleevecityusa.com/ultimate-outer-5-0-record-sleeve-p/9390.htm

Funny you should recommend Sleeve City.  That is the company that I use for my inner sleeves.  It's the extra protective layers that causes the snug fit.  But any protective sleeve that is bought will serve up the same situation.  I was going to purchase some outer sleeves anyway, so this new occurrence just pushes the call up a little sooner.  Thanks again for the enlightenment and information.  Just proves again that when you think you know it all, you don't know it all. 

BTW folkfreak.  I just took the time to take a peek at your rig in the Virtual Systems.  In the words of Darth Vader,  "Impressive.  Most impressive." You are one serious hobbyist, with attention to detail.  Your set up is to die for.  I want to be you when I grow up.

Thanks @skipping appreciate the kind words on my system. Just been enjoying my digital rig this morning appreciating switching to the DSD outputs on the upsampler, with some new digital cables this has really come into its own and sounds very analog. I've got a DCS Vivaldi on order so that should be another step up

still the record player outdoes the digital rig most of the time, for that I'm looking into a Herzan stabilizer and we'll see what that does

anyway look after your LPs and they'll look after you!

Decorate the walls of your listening room with the sleeves! Musical art.

In terms of collectability or monetary value, the original sleeve adds nothing, unless it is particular to the record. Standard printed company sleeves are utterly worthless. Blue Note sleeves included. That being said, I always keep original sleeves with any vintage record that I obtain, printed or no.

One thought...

If it's a record that's played 'semi-often', substitute a generic sleeve for the original.  Store the originals in a file, labeling same as to what it goes to.

In that way, the sleeve is spared the wear 'n tear of the old in 'n out.  Old paper is old paper after all, and time doth take it's toll...

Or, better...dup it if it's a real collectible.  Play the original only when you 
Absolutely Have To.  Entropy is inevitable....

Thank you all for your input.  It was much helpful.

psag, a question for you, if you don't mind regarding vintage records.  What year, generally, would that classification start?  1940's, 30's, or earlier?  And would any year for LP's fall into that category? Thanks.

If the original ad sleeves make too tight a fit, sometimes I slide them in the outer sleeve behind the album cover. Those old ads are an entertaining read sometimes. It's not every day that you can read promos for England Dan & John Ford Coley! Cheers,
Spencer

If you like an old musky smell along with incubated mold spores, go ahead and keep those old inner sleeves. 

@testpilot you read my mind! Yes, I do like it ;-)
I use MoFi inner sleeves, however, if there is anything special about the original inner sleeve (even if it's just a cardboard stock in black color, like recent 180g reissues of Dead Can Dance), then I use "NAGAOKA No.102 anti-static record sleeves". They fit nicely inside any inner paper sleeves, and keep LPs safe from all the goodies mentioned by @testpilot
this is how they look:
http://www.analogueseduction.net/sleeves/nagaoka-record-inner-sleeves-pack-of-50.html
and available from Amazon or eBay (surprisingly, not from AcousticSounds or MusicDirect)

I discovered them quite accidentally, when searching for the similar "inner sleeves" for Japanese Mini-LP CDs which I just cannot stop collecting: they are so cute, especially in those neat "promo" boxes. Total waste of money though...