It was a gift from mother nature to start with, so I did not mourn the loss. Easy come, easy go.
I think some crests are much more stable than others. The more spontaneous they are, the more likely they seem to be to revert. A crested plant that has been propagated as a crested plant for many years is more likely to stay that way. Something similar goes on with variegation.... a spontaneous variegate is more likely to revert (sort of by definition) than a long-term stable variegate.
Here's a reversion that has been working in my favor, generating lots of new (normal) heads for propagation:
Curiously the crested plant has given me many more new (normal) heads to root than the normal one I have that's a few times its size. This crest is still definitely teetering on the brink.