Look at all the negative press they got over the squirt gun and pellet guns being bought and turned in. Now immagine the bad press that would come from a group of say 100 or more people showing up w/ 2 mosins each. Trading them in and then going to the press as a group and explaining how now they can go out and buy 4 mosins each. Or "I sold a few shitty $50 guns and now have enough money to go out and buy an assault rifle. Thanks Boston!"
Doing it as an individual doesn't get you far. But doing it as a large group and talking to every media outlet that will listen after will absolutely have a very negative effect on these buybacks. Especially since this one seems to be privately funded. I bet the antis who caughed up the cash this time won't next time if they knew their money was being used to buy MORE evil scary guns...
solid reasoning
sidenote, why won't they give money for rifles? I heard ones with detachable magazines are very dangerous and kill indiscriminately