Same here. I tend to jump on sale fares for domestic itineraries. Last year I did 10 JFK runs, and this year I've already completed 9 of 10 DCA/IAD runs, and also booked two of the IND $99RT fares. When I was a heavy UA flyer, my runs were to Florida (MCO,TPA,JAX), some overnight, and some right back after landing. The miles come in handy for international trips in business class. I can't ever recall being bothered by anyone on domestic routings.