I would agree that an R380 should be worth more than what they sold for originally...  There is a strong collector market and less than 300 made.  Right now Remington is supporting them with warranty coverage, so there is no real downside.  Plus I think the .380 is a very durable gun anyway.
Value could go up even higher if Remington's "new" Rohrbaugh design (if it is even called a Rohrbaugh) is noticeably lower quality...which seems likely.