Hmmm...that's a pretty high price point, but remember that Lion King theater show last summer was running around $200 a piece.
Personally I wouldn't do it. However, IF it includes alcoholic drinks (and that's what it sounds like) and "Hillarious Stage-show numbers" I could almost see it being worth it. If they give you a real long time (say 3 hours) and the crowds are somewhat limited, then maybe it will be worth it.
A little added research makes it look like it will be Saturday nights only. Starts at 7:45 PM and only one "showing" per night so that's good. However, doesn't say how late it goes. On some nights, the show start time is actually after park closing. (January 23rd the park closes at 7 PM, show start is listed at 7:45 PM.) Again that makes me question how long it lasts and how rushed it will be. (If they only give you 90 minutes for that price, they'll be a lot of unhappy customers.)
Also mentions "Banquet seating" - which tends to make me think it is buffet style eating with a stage show and dance floor.
Doesn't specify that it is adults only, but do mention "alcohol only served to 21 and older" of course, and there is only one price - no kids rate.
Another piece of information missing from the "Inside the Magic" site:
So looks like the 4 mentioned in the original article plus Dr. Facilier.
It'll be interesting, I'm sure it'll be very popular event at $99 a person, especially with it being only one night a week will leave some exclusivity to it.