When purchasing or selling used tivo's on ebay... should I worry about buying a used tivo with lifetime service from someone who publically posted the service number? (my concern is from the service numbers being made public) Also, when I go to sell my used tivo with lifetime srv, should I erase out my service number from the picture? I see many people do this, but I also see many people dont. So, I guess my question is - does it matter? Pros? Cons? Thanks.