I have this feeling I've seen a character like Brax before -- pig face, trader, even the checkerboard part. But I can't think what this is from. Some computer game no doubt. Someone help me out here, this is killing me.
I don't know about the face, but the checkerboard pattern and the background music has to be a reference to Stan from Monkey Island.
http://www.secrettoeverybody.com/buysomethin Now combine that with the "secret to everybody" Moblin, and... http://www.secrettoeverybody.com/
Well either this is a serious case of deja-vu or in some game I've played I've run into an NPC with a pig face that sells stuff. You're obviously right about 'buy somethin will ya'.