Because I wrote an "extender" program for the 8810 (which would be harder to do for the 8910 and no one has yet).

The extender lets you put macros and key moves on keys that normally can't have them, it corrects design flaws in the home theater mode, it handles the fav key in a way most people (everyone who has commented on it) think makes more sense than the UEI design, increases capacity for key moves and macros, and lots more.