It doesn't make sense financially at any track I know of. If I can run NASA at VIR for $160-170 per day (I can run free and instruct, but I'll ignore that for the analysis), then what sense does it make to pay several thousand dollars up front if the daily cost is around the same anyway?
If I was made of money I'd join. I do think it would be something cool to be a part of, and member only days would be cool etc. But from a pure financial standpoint it is a waste.