Do you require immediate payment on your Buy It Now items?

I have had luck with listing stuff as buy it now, but in the last few weeks I have had (0) feedback buyers winning and screwing my listing up. Should I make immeiate payment required? Would that steer away any potential buyers?
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Bosox1976
But in fairness to the other side, I also hit bin's and for various reasons can sometimes not pay until the next business day. So if all sellers required immediate payment, it would hurt me occasionally.
Something to keep in mind if you go that route is that if you accept a "best offer" option on your auction, they are NOT required to pay immediately (for obvious logistical reasons).
Mark
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.
Probably 90%+ of my "Buy it Now" buyers pay immediately anyway. Yes, there's been a few who haven't paid but no big deal - I just relist it and sell it to somebody else. I think the good far outweighs the little bit of occasional bad.
Collecting 1970s Topps baseball wax, rack and cello packs, as well as PCGS graded Half Cents, Large Cents, Two Cent pieces and Three Cent Silver pieces.