I had the most extensive search ever of my luggage today at SFO. The customs agent said I was picked for a search because I flew to Singapore for three days, for leisure, I said all I did was go shopping (in that heat I couldn't bear being out of the AC too long), and I was traveling alone. I didn't mention mileage run because I didn't think the customs agent would understand (do they?)...but we all know the value of 51,000 miles for a $600 ticket and a weekend sitting on a plane.