Two Turntables? Why

I guess its the human need t compare, contrast, fiddle - collate. I don't buy that one sound is absolute and perfect - high end cartridges are a prime example - some are warm - some are cooler. Certain decks I guess are better for different music I guess - or moods

I have one TT with an extra cartridge sitting in a drawer (for 8 years). From a purely justifiably logical standpoint (something you may be able to justify to a wife who is not allowed to touch anything in the stereo or records except the volume knob) I can easily see having a two arm table for mono vs stereo without hassle if you're that concerned with that, although I've heard that is not a big deal. I can also see using one arm/cartridge for VG+ and below records to do less damage to a less expensive cartridge. Maybe an extra table for that reason feeding a 2 input phono stage that could be less expensive tor two complete tables versus a 2 arm table (but you may have the wife complain so a two arm table may ultimately less expensive for you).

Of course if you have multiple systems, that doesn't count. Each certainly needs its own turntable.

Beyond that, it's an equipment hobby, like rolling tubes, which is fine if you're into that. And swapping in and out multiple tables is a space/convenience and cost issue, like reel to reel vs. analogue and analogue versus digital.

That’s easy. One my wife is allowed to touch, and one she isn’t. 

One I have had since forever and it is "main". I barely use it, in fact. Elvis and I have had the other one (Dual). I mean, I used to listen to one like that a lot many years ago so I bought it recently just to see it again. Elvis had the same one, not mine of course. It is in the box in friend’s garage. So, technically, I do own two turntables although I doubt this scenario is what you were asking about.

I have a TT in the LR with my dope system. But that's next to the TV room my wife likes. I also have an "office" with another system w/TT. It's about keeping peace in the valley.