My thoughts are that you went overboard registering these 3d domains but if what you told me about your sales is true keep on keeping on. You can probably register 3dinformationandstuff.biz and get x,xxx for it.
A domain is worth whatever you can find some retard to pay for it, right?
Reseller, this should be a reg fee domain. Given domainer 3d mania, who knows.
I know if I were you I would take most of my chips to the cashier and cash the **** out - hang on to 3dtv.com type domains that will actually be worth something once people shake off their Avatar-induced stupor.