Never been bothered with private plates, I give the DVLA enough money every year (over £1k in road tax), not giving them any more. The money the make out of transfers, retention etc is unbelievable.
Also don't want my plate to be something memorable if I'm being naughty... :)
To me, it's just a bit of plastic on the car that I couldn't care less about. Doesn't improve the driving experience to me. Would rather spend the money on the cars themselves.
I quite like driving a Ferrari with the proper old-school prefix numberplate, bit of inverse snobbery I suppose