I think you guys are confusing Bell Services with Magical Express luggage delivery. Bell Services will not deliver luggage to your room unless you are actually in the room, how else would you be able to tip them?

If you use the Magical Express luggage delivery, you do not need to be in the room as their tip is included in the price they charge Disney. And they do state that if you use the Magical Express luggage delivery it COULD take up to 3 hours after you check in for your luggage to show up in your room.
I hope that clears things up.