Sorry to use this example, but if people want to pay 150K for a DarkJak head, rather than 20K for a head, then let them.
That's invading their sale thread a little though, so maybe it'd be better to open an appraisal shop? Like, you see a head you want to buy, you send 100tc to the TTM and we appraise the head for you?
dunno about you guys, but higher prices dont necessarily mean better sets