These online payment processor give a platform to store and pay your money. The balance will be spent on varied programs like HYIP or Forex or PTC and lots of a lot of. Or the balance will be used to get plenty of product online and pay through the digital currency instead of accept credit card and demand drafts. And for providing such service they charge you some fee on each dealing that's created. The fee is generally on the money you receive and not on the money you send. This can be however digital currencies work.