Any nerd can fit a car stereo/amp - it's a chance to:

a) Get new tools which are "essential" for the job
b) Spend hours under the dash/seats/carpet of your car
c) Snap irreplaceable plastic clips and shout "bugger!"
d) Find you haven't got some specific part when you are 99% done

I can understand people with nice/new cars not wanting to do this, and having a car of which there are only 100 in the country does cause it's own problems! (parts are easy though - thank god for limos!)

Gareth