There's now a version of GEM you can run on a Lisa. But 68KMLA is down so I have no easy way to link to the relevant thread. :(
The original version of GEMDOS (the replacement for DOS or CP/M when running on 68k) was in fact developed on the Lisa as a 68k dev machine [also some Motorola VME dev boards I think?) before actual Atari HW was available. So it's a full circle thing.
In the vintage computer collector/enthusiast scene, there are probably dozens of working Lisas. How's that?
A few years ago I got my nephew to do up the flat for sale, and he junked the lot - at some point you have to get rid of things.
I will never buy anything except a laptop again.