I understand Wikipedia should never be seen as a reliable source, but this seems to be the reason.
"Stage 42 is one of the largest Off Broadway theatres but has proven to be an expensive venue to mount shows, partly due to contracts with theatrical unions. Theater producers have speculated that Stage 42 might become a Tony-eligible Broadway house, by the addition of one seat to bring it to the 500 seat minimum required for Tony eligibility. On the other hand, going to 500 seats would probably require negotiating new contracts with the unions, raising costs further."
My father (AIDS)
My sister (AIDS)
My uncle and my cousin and her best friend (AIDS, AIDS, AIDS)
The gays and the straights
And the white and the spades