Does anyone run 2 or more turntables...

I have two turntables each with three arms...
http://i.imgur.com/r2AM7An.jpg
http://i.imgur.com/msMbfXy.jpg
What is my purpose?
I have had around 50-60 cartridges over the years and have 'limited' myself currently, to the best 30 or so.
Despite what most audiophiles think.....it is simply not possible to accurately compare the sounds of multiple cartridges when one needs to unmount and remount each one in a fixed arm on a single turntable.
The differences between top MM and LOMC cartridges are often sooo subtle and elusive....that our aural memories cannot cope with the time lags.
That's why all but one of my arms accept interchangeable headshells so that I in fact can go back and forth with dozens of cartridges in short time spans.

Now admittedly this may not be important to most audiophiles....and it wasn't to me in my single turntable/single arm/single cartridge days....but having experienced the luxury (and pleasure) of multiple arms/cartridges over the last 6 years......I will never go back 👀

I have two complete operational turntables, a VPI and a Sota Cosmos.  I have briefly run them in one system (the preamp,, which no one has probably heard of, a Classe DR7 has two on board phono stages), but now run them in two separate systems.

I have had two for almost a year and it's been fun....but now have a second armwand for the better TT so will be back to one again.