I could be mistaken, but given the diminishing effectiveness of my popup blockers, I'm pretty sure that there is an ongoing arms race between popup blockers and popup advertisers. My question is, Why would you want to force popups on someone who has gone to the trouble to install software to block them? Isn't it more likely that you'll just piss them off and make them vow to never buy your product? Are they really going to admire your popup's spunky can-do attitude?
Anyway, it's just a thought, and perhaps too perplexing for the pestilent popup people.