Actually, the subscriber base very often completely sells out shows at the Mitzi (and very quickly). This happened with the last show there -- Wendy Wassertsein's THIRD -- as well as with BELLE EPOQUE last year. In both cases, the entire run sold out within 48 hours of member tickets going on sale -- long before tickets went on sale to the general public.
There are always cancellations, though, so with a bit of persistence, you should be able to get in at some point during the run.
And yes, it's a small house so there are no bad seats.
"What a story........ everything but the bloodhounds snappin' at her rear end." -- Birdie
[http://margochanning.broadwayworld.com/]
"The Devil Be Hittin' Me" -- Whitney