I think you're wrong. If the manufacturer requires ID to purchase then they absolutely can stop scalpers as it would be too expensive for the scalper to hire people to buy their limited number (say 3) of items per month/per year. Capitalism can be beaten into submission if you're willing to take the proper actions, if they're interested in the Pi's going to hobbyists and schools rather than to scalpers who buy hundreds of them and then resale them at 10x the price on eBay or other auction sites. I know libertarians don't like to hear that not everything is about money, but sometimes it is if the source truly wants to see the pi units get to the right people.