Why sell? If you don't like the figures, sure, but if you like the license is anyone going to do as thorough a job as Hasbro did? Especially with unmasked heads?
They don't really do it for me. Maybe if I had the updated figures with the more accurate helmets I'd be more content. Bare in mind, I've kept my MMPR display tidy to just the five original Rangers plus Green and White. I don't have any of the monsters or variants. If I can get a decent chunk of change for them and put it towards something I think is more on-model like the Mezco set then I'll feel better about dropping the coin it would take to acquire that one as I definitely don't need or want multiple sets of Power Rangers.