Bronze horror was just a victim of the circular hotness in comics. A previously dormant sector or genre suddenly catches fire, prices rise with new interest from collectors who go "wow" when they see the covers (usually here on the Boards) and the race is on. Only to cool off as they are no longer "cheap and cool" but have become "fairly expensive and cool, but not cool enough to go after them all at these prices!.
Id say be happy that the wave happened at all, because these books deserved their year in the sun... and will rise again.
I just became interested in these in the past 6 months. Mostly HOM, but I will buy any DCs that I like. That being said, some of the prices are pretty crazy. But what a great offering of some great covers from some of comics greatest artists!