I would assume it has to do with the R700 "pedigree" more than anything having to do with the M70 itself. The M40, M24, and 700 Police probably cater to the large market share which wants what the gubmint uses.
After seeing what a lousy product Remington was putting out since 2005, though... I was dead set against anything they make. And now they aren't making guns at all anymore... so the market may shift to some other action over the next few years (or else go to custom, non-mass produced rigs).