I know pros who do it. Not naming any names but you get 1 or 2 on here who do pro and WC. A general WC and/or MMA show = Big name ex pro hard case vs complete novice (or perhaps another ex pro if your lucky) then the rest of the show is just local hard case vs. Cannon fodder. They usually have about 15 fights on and get through them in no time. I know coz I've been to a few and been on the business end myself
also when ever I'm told about it by others it's always the same story. You should be ok with 11 amateurs to your name but trust me the 'promoters' are snakes and you can get put in with much bigger lads.