Does anyone have credible information why Dish will not allow more than one receiver upgrade per year. I purchased a HD Plasma last February and an additional HD plasma this month. I was told by people at Dish that I could not upgrade to a HD receiver (VIP 222) until after February. I was willing to pay whatever charges that were incurrred, but to no avail. This is puzzling to me, considering the influx of HD channels by both Direct TV and Dish in recent months. Just curious. Thanks.