My theory is that they mirror the LiLs to save bandwidth. If they provided the redundant data for both the OTA and LiL, that would be twice as much data. Considering the numerous amount of LiLs, that could significantly lengthen the amount of time it takes to download the guide. Sure they could stop mirroring during a dispute, but that takes time and money, and I'd say that very few of Dish's customers actually utilize OTA. As far as PSIP, again, not enough people utilize OTA to make the investment worthwhile, not to mention how unreliable PSIP is to begin with.