And yes, it's not hard to spoof your hardware id, but who is going to buy a machine at scalper prices only to then need to run sketchy software to even be able to use it. It'd completely kill the scalping market and not affect anyone buying one to use.
Second: They could easily allow any account to log in as long as the account that bought it is an actively logged in profile.
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More complications, more points of failure.
But as I said, you don't like it. ;) Scalping is freedom, if you want to remove scalping, you have to remove some freedom.
"Truth in advertising" in your OP :)