I spend the miles almost as fast as I earn them. I would rather have a cash discount in lieu of these miles. The travel vendors are not getting super loyal customers either. The typical "Gold" membership does not mean a whole lot. Let us face it, even the travel vendors cannot get off the mileage treadmill, so they keep on diluting the value of the miles/points.
Thanks to this board, I have been able to maximize my mileage earning/spending capability.