yeah, the problem is Starbucks cards are sold for very cheap price in market...so no one will be bothered to buy one at 80% price...
The reason i say this is because one guy was trying to sell the Starbucks card here, but no one is interested in that...
If you see the price of current Starbucks cards in market, you will be shocked..Good luck with it, but try to give it to your friends who go to Starbucks regularly and try to collect your cash, here its not gonna work...