Seems a little odd to me, but if I was on the east coast I'd probably consider it. I've done stop-overs that only lasted a couple days each. On the way from BKK to JFK, I stopped over for a couple days in NRT. Then from MUC to ORD I stopped over for a couple days in LHR. It's fun to hang out in another country, even if it's only for a couple days. Environmental impact is really high though for such short trips, especially if you make a habit of it.