This is a great question! As a ( year D* customer considering making the switch to E*, I found myself wanting to read good reasons to stay...but in all these pages, there are only isolated reasons.
I went with Directv 9 years ago because our local cable was so bad. For a while, I kept the most basic of cable packages just to get the locals, but eventually D* started offering those so we went totally with D*. Over the years, we have lived through all the changes and enhancements, from the introduction of NFL Sunday Ticket (which I had one year and then dropped because I wasgetting more than enough NFL games on regular TV for free) to HD. Ihave gone from ancient equipment to a SD Tivo, to HD Tivo. Tivo used to be an advantage, but now that is going away and being replaced with D*'s crappy HD DVR. D* once had a great selection of commercial-free music channels, but now they have XM...and as much as I like XM, I prefer NO TALK!
At this point, E* seems so far ahead of D* in terms of HD content and equipment, that I simply no longer have a reason to stay.