Chairs would definitely be nice! I would probably pay a bit more, maybe $79. The bigger issue for me is that guests are once again crowded into a small area, where not everyone gets a good view. I've been reading reports where people leave the dessert party up to 45 minutes early to get a good spot in the reserved area. That's the biggest reason that I'm now on the fence on whether it's worth it for our Oct. trip, after being ready to throw my money at Disney to reserve this back in June.
Launch bay may be a better environment for the dessert party (and weather was a big factor outside), but I REALLY liked the idea of tables to spread out the crowd in the viewing area. Everyone could see, and everyone had a little breathing room. That's what made the party seem "worth it" to me, more so than desserts or drinks. I would pay more for that type of setup again. Paying to stand shoulder-to-shoulder in a crowd for up to an hour is significantly less appealing to me.
Thanks to everyone posting reviews here! I've been following closely as I try to make up my mind (assuming Disney every releases dates for the rest of October!)