In olden times, the DCM would sell a NRA member ONE firearm of each type on an affidavit that it was for his own use, not to be resold. One in a lifetime. But that was the DCM, a government agency that did not have to make money or even expenses.
The rump organization in the CMP does have to meet expenses and they operate on a more commercial basis.
Anecdote Alert:
1. At one time, CMP would sell each member 5 Garands. A gunshow wheeler dealer enlisted his whole family, each ordered their five, and he sat down with 25 rifles and a chart of part numbers. It is well known that almost all Garands have been refurbished in regular issue, and usable parts were reinstalled with no regard to origin. So he was able to swap parts around, probably buying some, to assemble a few - maybe as many as half a dozen - "correct" rifles with all identifiable parts of the same make and period. Not original, but "correct." Which seemed enough for the Garand enthusasts, because he sold those "corrected" rifles for more than he paid CMP for the whole 25. The remainder, not much worse "mixmasters" than they had started out, were pure profit.
2. Then they took the limits off entirely. I bought a new Kimber .22 at Anniston CMP. I wanted to buy a cheap used one as basis for a custom job like I had seen on the range, but saw the guy ahead of me pick the six of best condition $150 rifles, I gave up on that project. They had gotten in some Winchester Model 52s and Remington 40Xs, too. I watched a guy walk up to the Winchester rack, wrap his arms around as many rifles as he could grab, and heave them over to the counter. I am sure he was going to equip his junior club with classic rifles for the kids to learn to shoot with, right?