Each state has its own strategy to ease the financial burden. New Hampshire asks residents to pay higher registration fees, then puts the money into the trails. It's all state-funded up here. Maine divides its money differently. Some towns spend some or all of that money on snowmobile activities and some don't.
Equipment is a whole separate issue.
But while both states could gain registration revenues from ending reciprocity, they could lose money, too. Everyone has an opinion about how much, but no one has much data. It all depends on how many snowmobilers will pay to cross the border and how much they'll spend if they do. But if Maine starts charging, many New Hampshire snowmobilers swear they'll stay home or travel to Vermont or Quebec. They're mad that Maine is pushing the issue so hard to drop that reciprocity.