Might seem a moot point but must ask....
The issue of purchasing tokens, stamps, credits or whatever name you want to call it. Does your comments refer to the transaction taking place at the source, ie, paypal, then from that point on become tokens. Or does it equally apply to the purchase then at the website concerned, the dollar value split up and then get converted to tokens.

I ask this because the latter is what I do on one of my sites, it is a matchmaker and that scenario is actually very common as a means of exchange and currency on such sites.