ultimately, who cares about the resale value...unless you plan on reselling it.
if you spend $500 on a saw, any saw, and spend $300 on a mastermind port job (or whatever it is) .... do you think you'll get your full $800 back? probably not. so, its not ALL about resale value. its a good guide for when working with a saw though. even if you put $300 into the saw... is there any saw on the market that will be able to touch it for performance. NO. so.... it might be worth it to spend the $$ and money. AND, you'll have a boat anchor soon if that clamp doesn't get replaced anyway. ... lots of stuff to consider, but I don't think that the plastic case is a functional downside. resale, maybe. functionally, no.