Interesting, I was several years ago seeing the transaction delays climb into the hours, but not the fees (ya, maybe I should have set my fees higher, just went for average). I wonder how much variance there is in the network and if you are just lucky, or somehow frequently get picked up in maybe a less busy part of the network, or if there's some attribute you unconsciously use that gives your transactions so much better than average performance? Either way, enjoy your advantage while it lasts!