well, in the end, the people willing to buy bitcoings for EUROS/USD are indirectly paying your bounty, for the electricity/time you put in mining the bitcoins.  BTC are only worth what people are willing to accept for them, be it goods, or government backed currency.  But yes, at the time you solve the block, the BTC are coming from nowhere except the work you put in.  There is no real world analogy for this.

Will