We'll be there in Oct. too and will likely skip the party. We might do one if you could use a day of a 5-day PH for it, but not for that much extra per person.
Last time we were there was last Spring Break (2011) and on Fri. night it got kind of a high schooler party atmosphere and it was so obnoxious. I'd hate to re-live that, complete with high price of entry.
What was that neon light bedazzled party that used to be at DCA at night? I never really got into that, either, and it was free. Or the WDW nightclub party thing... Pleasure Island or whatever. Just seemed like an excuse to sell weak, overpriced cocktails and glowy souvenirs. (Bah humbug.)