Bitcoin and most(all?) crypto currencies pretty much suck for payments. I think a BTC transaction costs around $16 USD just to get it on the blockchain now. Plus transactions are not private, and they are permanently public, so even if your BTC Address is unknown today, doesn't mean it won't be known tomorrow.

There are perhaps, some reasonable arguments for using crypto-currencies, but buying groceries is not on the list. Buying Houses... *MAYBE*, since that information is already public anyway.