[playersare]

25c/50c is very nominal for bonus clearing. you might be better off playing on a site which doesn't charge rake at those levels.

check the tables on each site carefully to see what the specific rake/bonus impact is for quarter play:

name - rake - bonus
Party skins - N/A - N/A (lowest limit 50c/$1)
Paradise - none - none (rake/bonus starts at 50c/$1)
Pokerroom - 5c/$1 - negligible
Ultimate Bet - 5c/$1 - negligible
Poker Stars - 25c/$5 - negligible (but slightly better than PR/UB)
Prima - 5c/$1 - varies (but generally negligible)

so...50c/$1 is where you start thinking about bonuses. below that, try to avoid getting raked.