Well, that could be said about all the machines we play with in these forums. Virtually all of them are useless by modern standards. We still play about with them.
Personally, I've never wanted to own a 7200, but the Power Computing clones based on the 7200 are very good machines-especially the PowerCenter Pro with its 60+ MHz bus speed.
Also, I have a 7500 I've pieced together, and I have a bunch of 7200 motherboards which I acquired in order to steal teh Bandit chips for a project. Having those things on hand has led to booting it up as a 7200 from time to time for other interesting projects. For example, did you know that the "Kansas" ROM, the ROM from the 9600 Enhanced machine, will work in the 7200?
It was also handy to have a 7200 for testing when I ended up with 1500 1MB VRAM modules after Power Computing's going out of business auction. As it turned out, those modules would not work in x500 machines, but worked fine in the 7200 and PCC clones based on the 7200.
Soo, there are uses for the 7200, as a test bed if nothing else. Oh yeah, I also used a 7200 board to map out half of my pin out for the Bandit chip.