Hasbro is charging what it does, because it can get it.

They are mining nostalgia and the collector's market and their recognizable brand name.

If they wanted to corner the market on 3 3/4" military, they'd produce things like the VvsV single packs, go after the CORPS crowd. I mean, if Lanard can make articulated figures that retail for a buck or less, Hasbro could, too. It's not like Hasbro couldn't use old tools. I doubt the TRU RAH 6-packs really costed that much to produce.