I agree with Davistev, while techincally I take some 'short trips' (i.e. my upcoming EWR-HKG 3/29-4/1) which could be considered mileage runs. I'd never go on a trip to somewhere I had no interest in being. I also do fairly extensive research on my destinations--so even if it is for 1 day-- I'll still make sure to see some of the sights. Additionally, I usually combine these 'trips/runs' with stays at hotels where I'm an elite or looking to add to elite status.