Let me jump in here and say that it's a popup to promote a Shrapnel product - it isn't a random, revenue generating, brightly flashing annoyance, designed to get you to buy butt-hair removal cream. All those ads were pulled a long, long time ago.
The feedback is good, but don't equate this with Shrapnel whoring itself out to the misguided marketters of the web. Tim just wants to make sure that people coming to the site are aware that he carries this excellent game.