Two Turntables? Why


OK, been thinking about this for a bit.  Why do people own two turntables?  OK, I understand some traditional uses for a 2nd turntable.  One that is just for 78's, for example.  You may be on a journey to a set up you really enjoy listening to.  You may have even gone the route of an external power supply, isolators, base, phono PreAmp.  All of the accouterments you enjoy because, well, you enjoy records.  But if you are enjoying your LPs and you have purchased a turntable, cartridge and potentially a tonearm that you really enjoy, why do you need a 2nd turntable?  

If you go through all that effort and fun to get to a sound and system that makes you happy, and many of us have, why do it for two or more turntables.  You got a good one, why do you need a 2nd?  Maybe you play all your old LPs from High School on one standard turntable and play all your MoFi and QRP copies on the better machine.  I don't know. 

So, those of you who own more than one turntable, please let me know why you have more than one.  Let me know your thinking.  I'm curious.

Thanks 
pgaulke60
My post was taken down, you have fully the right to do so.However advancing it was offensive  is wrong  , .There was nothing offensive  offensive  to who or to what group of people.Reading my post  again I realize that  it  may seems to the censors that I was advertising freely on your site for my table. If it is the  reason  , you are fully on your right  but  this should be specified clearly instead of   alluding to a possible offensive nature of  my words.I entered the conversation, talking freely like if I were in an audiophile conversation  , my mistake I was in fact  in a commercial, business oriented setting. My mistake , things have changed. 
I just realized that I do not have two turntables. I own three turntables.

I completely forgot about the ownership of Mitsubishi LT-30.

I have it because I found it. I have never gotten to putting new belts in it. Maybe some day. Otherwise, it lights up, rotates, etc. It seems it is only the arm belt that turned into goo. At least that is how it was last time I looked at it. It is heavy.
Two turntables is a good start. We have an LP12 in the living room my son an old Denon DP47F in his bedroom. My main setup includes a Woodsong rebuilt Garrard 301.
Seriously, this may seem excessive but each has its use and is loved.
Why not? Lets see. The expense. Lack of two phono inputs. Lack of space and as always the spouse. Otherwise it makes absolute sense. Frank Zappa use to record two records at the same time just to see what comes out of it. He wound up taking guitar solos from one concert and overdubbing them on another totally different song.