One of the reasons I stick with 1/72 scale is the price..but even those kits are getting outrageous. Hasagawa's forthcoming B-24D is rumored to retail between 45 and 75 USD (I'll probably buy one or more anyway, since it's my favorite bomber.)
Of course, it's not so much the plastic that adds to the cost..it's the tooling. It's extremely expensive to engineer and cut molds, and today's kits are far more detailed, accurate, and better fitting than those of the heyday of plastic modeling in the '60s and '70s. Also, the hobby just isn't that popular with the younger "Nintendo" set, meaning the newer state-of-the-art kits are aimed at the adults. That means smaller production runs, which require higher prices to make the investment worthwhile. Then there are the importers, who jack up the price significantly..many modelers can get kits cheaper by ordering them from Japanese retailers, even with shipping.
SN