I was a die hard mesh genny user for a couple years. In fact, for me, they were my 'gold standard' by which I judged other devices, as they came along, like Kayfuns, Taifuns, Squapes, etc. I only set the gennys aside when I began dripping, and eventually using bottom feeders and REOs. These met my 'gold standard'. I'm a pack rat, so I still have my genies and tube mods packed away. I've never gotten into the 'buy and sell' thing. I still have a couple DIDs, Krakens, Cobras, z-Attys, Bliss, AC9, and probably some RSSTs, AGA-Ts, along with a couple Poldis, GPs, Rollers, Nanos, etc.
I have so much stuff packed away, I'm sure I could vape forever. I think I even have a few sq. ft. of mesh somewhere.