The up side is they've usually kept their value because by the time you get a top of the line helmet kit and commissioned to get painted, you'll be spending around the low/mid $800 mark, not to mention the time needed to wait for it. Now, 99% of people on this site will probably not care much for it because they know they can get better ones here and/or have the patience to wait for one, but a lot of other SW collectors, who aren't focused on just Fett, will opt for the MR because its an officially licensed piece with not much turnaround time.
I, myself, have the MR bucket for now and dont ever plan on getting rid of it. I'm able to look past the few small inaccuracies as it really doesn't bother me at all. I'll eventually have to get a custom one from someone here though since I do want to own an ROTJ version, but its not on my immediate to-do list.