I have two Tivo HD units. Currently paying $10/m on one unit and $6.95/m on the other. The $6.95 is about to expire. To get lifetime on these units it will cost me $499 for one and $399 for the other. Doing a quick search on ebay it seems I can get a used TivoHD with lifetime for $300 or just above. Then assume I can keep my current Tivo's as backup or sell for $50+ each. So why in the world would I pay Tivo for lifetime vs buying a used model with lifetime? Right? Trying to figure best method (Cheapest) to go from my current setup to 2 TivoHD's (don't see benefit to Premiere models) with lifetime. And would calling up Tivo offering them a lesser $ for lifetime for both my units vs going the ebay route possibly offer me any success?