Well, I can't speak for others, but here's my rationale:
1) Cheapest BD player is a PS3. Can't stand games, don't even want a silly game console in my home, even if it can be used as a BD player.
2) Can't use my Harmony remote with the PS3 cause of the bluetooth issue. Yes, I know you can get some widget that receives an IR signal and converts it to bt for this purpose. Sorry Sony, but I bought the Harmony remote to reduce clutter.
3) Stand-alone HD DVD players cost 1/2 the price of a stand-alone BD player. Oh yah, I know there are some sale prices that bring down the cost of a BD player. Same applies to the HD DVD player!
4) I try to be brand neutral but in some small, perhaps petty way, I just want to see Sony fail.