Bertie the Bunyip writes:

Why, don't they accept the bankrupt?

Because (1) people who know the organization well know how dysfunctional some
of its members are, and that they might not make good team players; and (2)
people who aren't Mensa-qualified themselves might resent the mention on a
resume.

This is why many of the club's members do _not_ mention it on a resume,
although it's quite a topic of debate.