Outer Vinyl Sleeves, is it a good idea?

Since my LPs are all snug in their respective storage racks, I’d have to add about 50% more new storage space if I were to adopt that system, but there is no danger of that ever happening. As most probably know, most purveyors of high quality used LPs do sell you the album cover and sleeved LP as a sandwich inside a polyurethane envelope. I don’t keep them that way.

Doesn’t that double the horizontal shelf space required per LP?

I tried that and probably hundreds of others have too. In my opinion, the results did not adequately compensate for the annoyance. Nor have I ever perceived that significant dust accumulates on an LP via the open end of an album cover.  If that’s a problem , just rotate the inner sleeve so the naked edge of the LP is not exposed. Also, consider reducing dust in your listening room.

Mold is everywhere.

whart, because of semantic differences among words like “sleeve”, “envelope”, “jacket”, and “cover”, I am not really sure what it is you do, but anything that reduces the static charge that results from removing a vinyl LP from a paper inner sleeve (which is NOT the subject of this thread, or so I thought), is a good thing.

Nothing but a nuisance in my opinion. If you own a thousand or more LPs, do you mean to tell me you don’t want to risk wear on the album cover from pulling an album out of a record rack? If so, that means you’re likely playing only a select few LPs over and over again. Anyway I save about one out of 5, stuffed in a drawer.