I think it's a good idea and I would consider paying for something like that. My biggest concern is games that are missing.
I think you're going to have to be a little selective, though. There were a ton of crappy SFII clones flooding the market. I wouldn't guess there are a lot of people playing Fighter's History. Some games were crummy clones but have a following. Time Killers, for example, might be good to include (especially since you already have Bloodstorm on there).
As mentioned, any Neo-Geo fighter (which is a lot) should play fine in MAME. Garou - Mark of the Wolves, Rage of the Dragons, Newer KOF games, Waku Waku 7, and Kizuna Encounter are all excellent games. Also missing the World Heroes games which were quite popular.
Also, Playstation-based hardware will run fine on newer systems using either MAME or Zinc. This will include Tekken 1-3, Soul Edge, Soul Calibur 1, Battle Arena Toshinden, Star Gladiator, Street Fighter EX and more.
Don't forget Cyberbots and Pocket fighter either.