Making money with prepaid cards

Is anyone making money with this kind of affiliation system?
I ask this because there are a lot of possibilities like: Skype, Google, yahoo etc.
So who is paying for something that is free?

prepaid cards are still doing well in the immigrants communities but the rise of cheap sim cards is now improving as well…

but prepaid card market is quickly falling…word of advice is not to invest in any prepard card companies…lol