I thought it was a small minority of retailers engaging in this PSP Go boycott. I agree that it's a fine method to look at actual retailer reactions if you don't trust forum logic, but I can't agree at all with your reading.Unit hardware sales are obviously not high enough, and the margin is obviously not high enough, to justify selling a $250 unit that no one will buy any packaged software for, ever. These things are obvious by simply looking at what retailers do.
Gamestop and Walmart will sell the PSP Go. That's the two biggest AFAIK, in their respective segments. Gamestop, with their focus on used games, has the most reason to be irritated with the PSP Go's existance, and yet even they don't boycott it.