Because trying to find the locks in the dark is a nightmare.  The car doesn't have remote central locking and I don't want to miss the lock and scratch the paint.
The LEDs aren't road legal so I'll need to make a switch to turn them off when driving (actually I have a switch that I plan on using anyway), but they'll help me when I'm leaving gigs at 1am 
 
Oh, and I got a leather gear knob too.  Hated the knob that came with the car and it broke last weekend, so I replaced it.  Mmmm, leather.