I think that using it in lieu of the iPad's glass surface would help keep its glass clean a bit longer. Not an unreasonable question. Let the kids use it in lieu of the iPad's surface! The problem is that there is no visible cursor on the iPad.
@Brunno: Why buy a touchscreen device if you don't really want to use the touchscreen feature? Get a slim laptop instead.
"Keep its glass clean a bit longer"...It's a touchscreen, it's gonna get dirty anyways whether you or the kids use it. Just wipe it off in one second. Using cursors on iPad games would not be as great as they are really designed for touch.
I think it's a reasonable question and was mine as well. There are times that I don't want to move my hands away from the typing plane of the Bluetooth keyboard to touch the screen. It's slower and stupid. Being rude to the OP does NOT help anything.
Now, that all said, you CAN if you jailbreak the device, but you will end up using a different product afterwards. There are number of Bluetooth mice that will work.