I pay for games using throw away gift cards. Vanill Master Cards.
I have around 15 of them on my desk right now. Some have $1.5 and some have $3.5 and all together there is around $50 worth of balances on these non transferable cards. Those balances are waste to me.
I am surprised nobody has set up a site to scrub these cards. I know they are popular, plenty of people use them. Mostly for security reasons. Balance on the card is all you can lose if someone gets the number.
I'd take it one step further and say, put a field in where I can input a dollar figure and the amount of credits I get is shown. Perp credit math out to around 2.5 credits per penny using the $10. for 2400 math. So flatten it to 2 per penny, allow someone to purchase as little 200.
The trouble with this is, I don't know if there is a transaction cost to making sale or if it's percentage. If there is no base transaction cost, this scrubbing system would work and would open up a lot of income potential that people see as waste.