One question an experienced blockpartier like yourself may know. When I did my first buy, my payout showed 13k, the second, like 3k(both were 500TH) Does the first purchase still payout what it said, or did it go down as more hash power has been bought? I would assume the second, but just wondering?

Oh yes, it goes down as the party goes on... People tend to keep buying as the party goes on, especially towards the end. The more people join and buy hashrate, it throws it. The block reward share will always go down, that's the insanity/gamification of it.