Yeah they're pretty damn rare, oddly nowhere near as popular as the Headmasters though. Always used to go for $100-$120 each, although might be more now in light of what you said about those cassettes. I know a few people who've bought Dino Cassettes loose/complete for under $200 each, if anyone's paid a grand for them in that state they need their head examined.
Also love that guy's self-asked question, I never did bother to read his response to my rant. Maybe I should. I especially like the "kiddies can't afford it" bit - yeah, I 'aint that old, but I do have about 100 packaged G1s, Microchange Megatron, Perceptor, Bumblebees, Diaclone Insecticons.. 3 Overlords.. all bought with money I earnt myself, I might add. Like hell I can't afford your piss-poor custom Fort Max carcass, bud.