I made a post about this a few weeks ago:
linky
I play at Crypto (high rake) and $3/6 costs about 4.1BB/100 and I get about 3.4BB/100 back in rakeback and bonuses with the re-instated 30% rb deal.
This is 1.33BB/100 in rb + 2.14BB/100 in bonuses.
Most rb deals are around 30%, so if the guy you're talking to gets 2BB/100, then he's probably paying around 6BB/100 to play, which I doubt. I think that the Cryptos have amongst the highest rake (aside from Pacific).