Why are some Prime toys soooo expensive on E-Bay?

Hey guys,
I have only been collecting seriously since April and there seems to be this whole distribution mess with the Prime line, leading to higher numbers online. Especially for First Edition Bulhead, Optimus and, for some reason, certain Beast Hunter commander class figures. Did the states ever get these figures? If not, I guess it would explain the prices. Some e-bay listings call them cancelled while the wiki page shows none of that. If anyone can sum up the ordeal, it would be very much appreciated.
I have only been collecting seriously since April and there seems to be this whole distribution mess with the Prime line, leading to higher numbers online. Especially for First Edition Bulhead, Optimus and, for some reason, certain Beast Hunter commander class figures. Did the states ever get these figures? If not, I guess it would explain the prices. Some e-bay listings call them cancelled while the wiki page shows none of that. If anyone can sum up the ordeal, it would be very much appreciated.