If you were to actually attempt that approach, I think you'd get a reduction in signups because it would make cryonics seem even more cultish and anathema to mainstream norms, reducing the number of potentially amenable people who would consider it at all.
No, see, what you do is you have one cryonics group forbid women, and the rest of them make a lot of noise about how the first group is a bunch of jerks and don't speak for the community at all. The first group takes a status hit, yeah, but the other groups get a nice status boost, and the whole thing generates a fair bit of attention - and high-quality, 'this relates to me personally' attention, at that - if done right.
From Mike Darwn's Chronopause, an essay titled "Would You Like Another Plate of This?", discussing people's attitudes to life:
Conclusion, graphs, and references in article. As usual, I recommend reading Chronopause.com as Darwin has many good articles; to quickly link a few: