Yeah I don't see that as a realistic option.I think it will be an extremely rare type of person who buys the 4 pack with the intent of selling off bathroom Joker and an even rarer one who prices it below $550.
Agreed. The premium is $1778 from kit. Let's say after the release, the clown goes for $350. Arthur with stairs diorama goes for $400. Now you already need to sell the red suit with diorama for $550 so that you actually pay below $500 for bathroom Joker. And all of this is not even considering the selling fees you'll get hit with, unless you increase the prices of the other 3.It makes perfect sense in principle but I just can't imagine thee being a huge market for Arthur Fleck or hospital clown only buyers, which wil make up the majority of the parts people want to offload.
All in all, not worth it to me. But if you care enough about the figure, it might be worth it to you of course (as was the case with me with deluxe purple coat Ledger).
I guess the point I'm trying to make is: even if you buy everything for one figure, you should still expect to end up paying anywhere between $450 to $600 for the one you keep after all is said and done.