I run a web based auction sniper and recently changed the fee structure to: -10 cent minimum fee -1% of the first $100 the item sells for -0.5% of any remaining amount You are only charged a fee if you are the winning bidder. For example if you win an item for $5 the fee is 10 cents, win it for $10 the fee is 10 cents, win it for $25 the fee is 25 cents, win it for $200 the fee is $1.50. I also sell prepaid cards for my service, before my fee was simply 1% of the winning bid so I could say on a $10 card "Allows up to $1000 of purchases", but of course it's not so simple anymore, so how should I list it on the cards? Should it be something like: $20 Prepaid card "Enough for up to $2000 of purchases or one $3900 purchase" Is that good or should I write it differently?