It depends on how much the transaction is for.  I'm OK with giving $1.00 if what I'm sending is a few hundred dollars.  If it's something like signature campaign earnings, I'd be willing to pay a few cents at most.  Maybe a dime or so.  I like wallets that let you adjust the fees.  The blockchain.info wallet sucks ass for just that reason, though I forget what they're charging for a fee.