If they're complete sell 'em for $5 a piece... If not, sell them for $3.50 or $4... Someone will likely buy them either way.
If 21st were wise, they'd put out all figures with any head variation they had available to them, and then change the deco up on the headsculpts at varying points to make it even more diverse... As a consumer I generally love 21st's stuff with little gripe, but as a company I sometimes scratch my head as to why they don't do certain (seemingly) logical things like that.
I also don't get why they simply don't make ONE body of any given uniform type, no ammo pouches or anything, just very basic bare bones with belt and harness... Make the pouches removable, and save some cash. BAR ammo interchangeable onto any US body, M1 ammo the same, and on Germans MP40 or 44 ammo pouches interchangeable with K-98 ammo pouches... It seems logical to do the single bodysculpt and make the accessories additions to it rather than what they do now, then giving you the wrong weapon for the ammo on the sculpt, but whatever.
Anyway... If you're not into N. Africa there's not much reason to keep the figures. I say recoop your cost if they're complete and if they're not recoop some of your cost. I've actually gotta nab a couple DAK guys here when I'm out again to help bolster the troops for when Indy's in town.
