It's the only console that I've sold TWICE due to disinterest. Whenever I got my first SNES (which I shared ownership of with my siblings), I definitely played it more than the Genesis that we got at the same time. (Best Christmas ever!) Whenever we rented games, it was nearly ALWAYS SNES games. Whenever I was in my last one or two years of high school, though, I got so much more into the Genesis. I started to actually buy games, rather than rent them. I'd also get new games for Christmas, of course.
Once I moved away to attend college, I left the consoles behind, and I ended up buying another Genesis and SNES with my very first paycheck. (Previously, I relied on money from holidays and mowing yards.) At this point, I'd say that it was about dead even as far as which console I supported with new game purchases. Thing is, I was basing most of my purchases on other people's recommendations, and most of the big-name SNES games (e.g. Contra III, Final Fantasy VI, Super Metroid, etc.) just really underwhelmed me. It didn't help that I'd also played the Hell out of Chrono Trigger to the point that I simple stopped playing it. Great game, but I played it far too much. All that remained for me was Mega Man X, the sole reason that I even hooked up my SNES for several years.
At one point, though, I just didn't want the SNES or any of those games anymore, so I sold them. Genesis was more than enough for me as far as 16-bit games went, and I'd gotten into Saturn and Dreamcast in the meantime. I did, however, eventually get the urge to play Mega Man X on original hardware, and I was thankfully able to get my original SNES from back home.
I didn't bother to buy any games, aside from Mega Man X. There were some other games that we had with the SNES at home, but I never really bothered playing any of those. Whenever I moved more recently, I just sold all of it again. I have the Mega Man X Collection on GameCube, anyway.
With Genesis, it's different. Sure, you can buy eighty different re-releases of any given game, but Sega's never managed to get the sound emulation in its Genesis emulators right. Even unofficial emulators don't get the sound 100% right. I just prefer having the original hardware, and the game library has a much better focus on short, arcade-style games, which suit me better.