what the builder has collected is not the membership charges, but the cost of construction of the clubhouse under the garb of membership charges
even though the club house may be built by him fee of FSI, the builder will have incurred cost for constructing the club house
it is that cost which builder has charged and not for membership per se
the builder used the membership charges collected from buyers and from a portion out of that, he must have constructed the club house and balance he retained as his profit
since all buyers must have been made to pay for the membership, all of them will be entitled to use the club house and its facilities after it is conveyed to the society alongwith the building and other common areas