One reason for it getting less may be people going in at the $5 level though they they went in at $20 for Women or Queers because they don't actually need two Destroy Megapacks. That was certainly my thinking. You would need to look at numbers pledging at each level in all of them to see what's happening (which would be an interesting exercise, but I don't plan on doing it).

Personally, I'm dropping hints for Crips Destroy SF every chance I get ;)