Being a "Marine" truck (if it has the lockers and other upgrades) might increase the value to a knowledgeable buyer if they want those.
The 900 series trucks suffered the same fate as the deuces when the floodgates opened. The scrap man got a lot of them, a lot were chopped/modded, and a lot of them went to work on farms or other endeavors. Us collectors got some and at some point in time prices will stabilize but it may be a while since they are still coming out the gate in large numbers.
I have a M927A2 which is a somewhat rarer truck than the average short wheel based cargo truck.
But it will only appeal to a limited number of buyers.
My target audience would be commercial since these trucks would be attractive to someone that wanted to put a custom spreader bed or some other such application on them (they have a longer wheel base and reinforced frame).
The other side of the coin is that I paid more for the truck and I may have to wait for just the right buyer (if I wanted to sell) to make a profit or at least recoup my investment.
If you can bide your time you can usually get a reasonable price.