I don't think it would be too much humidity if only ran once or a couple times a day. I do think it would be a pain to keep clean. It could harbor lots of bacteria if not regularly maintained. I don't think it's worth it IMO, but to each their own.
I agree, with all of my snakes in racks all the cresties are going in nice display tanks. Single adult males are going in R-zilla acrylic atrium and groups of adult females will be going in 18x18x24 exo terras. I just picked up one of each at the last phoenix show they through in the light fixture for free on the exo!