I never got it - you're buying vouchers en masse, that means you're using AdWords a lot, right?
So, are you good at it?
If so, why would you even care about going through all that trouble for $100?
I mean, finding a good campaign can easily scale you up to few thousands expenditure a day, would you stop for $100?
Going through all this trouble on a new account can be even worse, what's your earning potential from $100? Let's say you DOUBLED it.