As a promoter of a small soul night down here in Bournemouth which I've only been running for just under a year I've tried to go down the ovo route somewhat successfully as the dj's I've booked in the main so far to the best of my knowledge play only ovo.Possible one or two boots/carvers may have been played but you can't watch the decks all the time,plus its about putting people on the dancefloor as well.
Had a conversation while ago with a punter and he's of the opinion that he doesn't care what format its played on so long as he can dance but also admitted it'd be nice to know that it was an original.
Also someone I know who dj's was playing at a venue when another dj on before him played a boot/7's copy of a tune he'd paid a lot of money for and was going to play in his set.He wasn't a happy bunny.
I try to stick with my policy although in the end it may be my downfall but so far all dj's plus the punters haven't let me down and have enjoyed themselves.