No offense, but since you've never flown Midwest, why should they care if they "lose" you as a customer?
For anyone unaware, YX had a promo a while ago that offered 5,000 Midwest Miles to a target market in N. IL., quite a few people tried to scam the promo by changing their address, and then quickly transferring the miles to Amtrak or HHonors without ever taking a YX flight. Check out
http://flyertalk.com/forum/showthrea...t+10%2C000 for more info.