I haven't gotten any. I'm buying them through the USAir Dividend Miles Shopping now. Perhaps one partial explanation is that USAir's been running the Grand Slam promotion. You only get one "hit" in the promo for doing this, but a lot more people may have done it, and then gotten into the swing of just picking up a few miles, some to keep their accounts alive, with each purchase -- or trying to. May have helped to jam the system. But the Grand Slam promo only goes back to mid-September. Thus the "partial" adjective above.
Another possibility: There has been much gnashing of teeth on other boards about Cartera's terrible mishandling of the Shopping Mall. They're behind it, regardless of the airline or hotel partner. In particular, there was the AAdvantage mis-advertised fiasco, which was before the USAir promo. THAT was probably what did it in the first place.