haha nicehash is basically a miner hiring site, you point your rig at their service and they hire it out and you get paid in bitcoin or fractions of which we call satoshi (sat) after they take a fee of course. As for earning more than the antminer, ohh yes 3x the mining income on 2 thirds of the electricity too so thats always a bonus.
Prospero x1 i still have a pile of those laying around, these days they are only really good as heaters im afraid. curious as to which card you bought though, decent cards have all been snapped up :/