Actually, Melee is entering what they're calling it's Platinum Age, i.e. there was once a golden age where it was in MLG for a while, and it faded after that, but now MLG picked it up again (as well as other major tourneys like EVO) and the viewership/playership has massively increased.
People play on CRTs because they minimize lag. It's incredibly important in a game that's very timing intensive (attacks like Fox's shine are 1-frame long, his back air is 39-frames with damage starting at 4, etc...).
There were almost 1k entrants this year to EVO for SSBM alone.
This is one of the more fascinating things I've read on this forum in a while