We feel it was a bargain at $99 and still probably under priced at $129 for what you get, but in order to book a full room at each seating they need to keep that price attractive.
To compare:
Symphony Sky Dessert Party is $69 for Desserts, Specialty Drinks, Stein and viewing area (equal to a FP+) outside at stand up tables. Fireworks as well but you can see them with equal view for free.
Club Villain was $99 for Champagne outside at stand up tables, move inside to amazing decorations in event venue with assigned seating at tables for delicious Dinner Buffet, Desserts, Specialty Drinks, Beer, Wine, Dance Party, Musical Show and 4 Meet & Greet in highly themed sets with virtually no wait for 4 awesome characters. Room so decorated - there were many photo opportunities. Many more CMs clearing tables, assisting with food etc.
If you add up the items apart; Dinner buffet, Dessert party (since desserts much more than you find on buffets), champagne then free flowing alcohol, beer and wine, basically 4 FP+ to special characters, musical show, dance party with hard to see Dr. Facilier and all the CMs (worthy of a tip) you would be WAY over even the $129 price tag.
Seriously the best event we have ever booked at Disney.