I actually thought of the idea of selling my blocks at a profit but for a different reason.

Virgin unspent blocks are more anonymous than blocks that were acquired any other way.  If I were to go buy BTC from a brick and mortar Bitcoin dealer that "knows your customer" and then I go use it to buy drugs or something, there's a link.  Maybe one wouldn't chase it for drugs, but for something more heinous, maybe.

A freshly generated block has absolutely no history...