I think that there are really many price-points and grades of Russian SKS. At the top are the unissued non-refurbs - I suspect these will hold value, even more so if they are not franken-pinned. these are probably under-priced already.
Then there are the very nice refurbs and the issued non-refurbs, silver bolt and bayo, nice fit and finish, tight fit in the stock, all the better if laminate stocked. These are worth about what we are paying, around $200-225.
Finally there are the refurbs that seem most commonly available. Mix-match of parts, usually re-numbered matching, black bolt and bayo, painted parts, stocks re-numbered and often poorly fit, etc. These are likely over-priced. I expect these ones to drop to the under $150 price point very soon.
The Marstar guns are not going to be as-new from what I've heard. Many will be in used condition, though they will probably be nice and functional. Not sure ho they'll be pinned and we also don't knwo the country of origin for certain. A lot of ppl are thinking Russia, but that's not necessarily the case.
If the Marstar guns ARE Russian and are not franken-pinned, then watch the market fall like a rock on the existing frankenpinned guns, especially the heavily refurbed ones.
These guns are still a great deal and underappreciated. They are milled steel construction and making this gun today would cost the buyer close to $1000 at retail, if not more. We are spoiled by their cheap availability and a lot of guys disparage them the way Enfields used to be slagged back in the 1980's as a poor man's truck gun.
A dirty little secret is that I've always loved the SKS design - one of the best and most reliable semis ever produced - as an Engineer, I'm jealous I didn't design it myself. Easy to use and clean. Runs like an AK. What's not to like? Mine are all acceptably accurate as well, but I steer clear of the cheaper commercial chicom gun and the poorly and heavily refurbed black-bolt Ruskies.