If we mine for the Lottery using our NastyFans user ID, how do we get payout for BTC shares mined?
You do not get paid for shares mined while participating in the contest. You are essentially mining for lottery tickets. The plan is to eventually allow both, but NastyPool development isn't there yet.
During the "NASTY MINING 2 Year Anniversary" contest you are mining as
part of NASTY MINING. This is to celebrate NASTY MINING. Any P2Pool shares earned during the contest become donations to the nastyfans.
After the contest you will want to mine using your Bitcoin address as username so that you personally receive all payouts for your mining. You are free to do that now if you do not want to participate in the contest.
We have 2 more days of the contest. I have my GPU running a old cgminer (3.7.2) version with GPU support. It is only 10 MH/s but that will be enough to earn me 10 lottery tickets for that minted seat.
