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The characteristics that I find most interesting is that often these solutions turn into float-solutions. This means that if you have funded your wallet, you cannot cash the money back. You have to spend it (or pass it on to some-one else). Turning value into money have all kinds of ramifications and these solutions often limit the subscriber's ability to get the cash back for what has been deposited. This reminds me of Casino's where the ammunition is not cash, but chips. When entering a Casino, one would deposit cash in exchange for chips. This is very similar to the said mobile payment schemes. Only difference, with Casino's one can cash the chips in for cash.