>>9083416It's an interesting debate, but impossible to know for sure which way the nerd market will sway, so ultimately we're just speculating.
The comparison to the barge is interesting because of how many factors change between the barge and the sentinel for us to debate.
The barge was a vehicle, underproduced as you mentioned, and an experiment to see if nerds would even care about something that big. People who wanted one bought one as a vanity piece. It came with Jabba and Yakface, a major character who is one of a kind in his movie appearance, and an obscure background character. You needed them to complete the interior vehicle group, but you only needed one of each.
Compare that to the sentinel. A character rather than a vehicle, and one that is part of an army of identical copies. Already that means people pick up multiples for themselves. Add to that people have the barge fresh in their minds, so people bought an extra or two with the intention of selling them on the aftermarket for a decent profit like the barge. On top of that, bastion is headswappable to a genetic trooper, and the other figure is a generic trooper too. If you're a huge fan, you're happy to get three sentinels, and a bonus six figure team of prime sentinels lead by bastion. If you only wanted the big robot for your x-men to fight, the little robots matter less since they're going into a drawer, and maybe some other nerd will buy them to shore up their army.
Compared to Yakface and Jabba, prime sentinels are armybuilders. It would be like if the barge came with a gamorrean guard or a storm trooper, something meant to be in a squad of identical copies. Of course, that means if the sentinel is the only way to pick up prime sentinels, they're going to be pricey. If we can reasonably expect the prime sentinels to be available single packed like a stormtrooper or even Jabba, then their initial rarity is less significant and so then will their aftermarket prices be.