I doubt there will be any "legitimate" uses of this particular technology.
However, it may be a model on which we can base future online retail. The existing model is utterly broken: I really don't want databases all over the world holding my username, password, credit card details and billing address waiting for the next SQL or SSL vulnerability to vomit the information into the hands of criminals. Nor do I want to trust, use or respect services like paypal.
View this as an iteration towards a more secure and decentralised system for legitimate commerce which keeps credit card and escrow companies out of the equation. Surely that is a good thing?