Jesus H Christ! 2 G's for a table? You know, where I'm from, a person can get a decently sized house with a 12,000 downpayment. All you have to do is stay home for 6 straight weekends in NYC. Apparently.
I would imagine that it gets you a certain amount of attention from a certain type of person.
At these venues you aren't paying for the table per se... these are generally minimum spend amounts for drink/food (pre gratuity).
For ticketed events, table reso also usually includes admission & line bypass for x guests.