I actually just shot Amazon CS an e-mail, seeing if I can get the digital download for the DoTD price, explaining how the Go can't run this version. Not sure if it will get me anywhere, but I'll report back on what they say.
Also, people, please, stop bashing the Go and the people who bought one. We are just as much of CAG's as anyone else, just because we want a system that is sleek, sexy, and convenient, doesn't mean we aren't CAG's. Hell, I even got my PSP-Go for free, and got Amazon to credit me $30 PSN credit when their PSP-Go deal went live a few days after. If that's not the essence of a CAG, I don't know what is.