The reason you don't see exotics at places like B-J, is that the attention is focussed heavily on the domestic Muscle Cars of the 60s & 70s these days. For every exotic lover, there are 20 guys who are into old muscle. The exotics were hot about 15 years ago but no more, too expensive to buy and fix, and they don't have the nostalga tag to them (could care less about a 1969 Lambo, but a '69 Camaro w 396 would be interesting). Most ppl can't identify with the old (or even new) exotics and they are for the "rich elite". Guys spending the big coin on the old muscle cars are everyday sorts (plumbers, electrical contractors, engineers, etc).
Younger ppl (of which there are many on here) do not understand the pull of the muscle cars. You weren't there at the time.