This happens to be my favorite Mossy. Near $300 sounds about right for retail. I've seen some try to get as much as $500 for new but not in the box.
Here's the thing, I value the older ones higher than the new simply because of the action slide tube if the new ones have gone to the new style with the pinned action bars.
My 20" cylinder bore gun patterns better than the 28" Winchester 1300 Ranger with modified choke I have on loan.
What LES said is true, and the classic Persuader seems to be becoming rarer as "tactical" has become more and more popular. Well tactical and zombies.
I think they hold their value, especially to those who know the differences and see past the accessories. The 500 Persuader with a bead sight doesn't look like much, but there's nothing about them that has to be modified to make them good shooters out of the box.
I've tried a number of modifications to appearance and ergonomics and by far the best mod has been Hogue stocks and forends.