Its a real pity as these games are quite old when you look at it i cant imagine powerstone or marvel vs capcom raking in the money they once did anymore. Enough with the porn lets have these games i guess i can only dream of the day when i have a working version of virtua striker 2 
MvC2 is still quite prominent in arcades, and selling well on consoles. Yes, they do still make money for their disributors, and no, a MAME version wouldn't be a good thing just yet.
If you really want it that bad, buy them on your favourite console. The money you spend on them will go towards more games development by you favourite game manufacturers in the future, which is good for all of us.