In the $50 rooms, would you buy-in with double the amount from the $25 rooms ($14 or $20 instead of $7 or $10)? I'd guess you'd get even more callers if you were buying in for the same small amount. On Party, a 4xBB raise in a $50 room is $4 (1/2 your stack) - right? - so they'd almost have to call your all-in if they raised.