Audio Research certainly isn't making a killing selling tubes. It's simply a service the company provides because it sells tube products. If you've invested in ARC equipment, I would think you would want it to perform at its best, and you can be assured of that if you buy tubes that ARC has tested.
I found Upscale Audio to be rude, too, and this was after I had bought a set of power tubes for my ARC VT100MKIII a few years ago. Maybe Kevin or whoever I spoke to was just having a bad day, but there are several better options if you don't want to buy from ARC. Or go ahead and roll the dice.