You've clearly not played SC2. A competitive SC1 player can expect some basic skills to transfer, but the general body of knowledge they rely on (build orders, how to deal with situation X, etc) basically has to be thrown out. I can imagine a player who finds the lack of a settled metagame and body of knowledge that they can easily look up unsettling would retreat to SC1.
I also imagine a player who finds a settled metagame and easily looked up body of knowledge boring would pay $100 to guarantee himself a Beta key. Which is why I'm in the beta
Unfortunately, once the key is attached to an account, it stays attached. So they'd have to give you access to their Battle.Net account.