VC Poker/Doyles Room and AP have 200BB max, which is fun, but I don't know of any that have 50BB max. I wouldn't feel like I had good implied odds with my low pocket pairs with a 50BB max buyin, although it would mean less difficult decisions when holding, say TPTK in a raised pot.

I didn't play on party before the change, but I heard other posters say it was easier to punish the fish and get them committed to their hand.