Dude,

if you provide track 1 + track 2 + track 3 + PIN activation of the card you eliminate the need of physically sending the card. You could tap into a market of people who wouldn't want their drops known by their vendor. Also it eliminates the need of having to wait for it in the mail.

Regarding this new service you're offering. People find it a bit hard to trust other people with their money, because they've been burned over and over. I'm not saying you will burn people, but sometimes legit arguments are formed...like for example: what if a customer sends you $500, and your card gets blocked after cashing out $100. Will you be a real biznesman as you say are and fork out the money from your end? I think not. So what I suggested allows people to deal with their own problems, instead of having to trust someone behind a monitor.

Just some food for thought!