PPC's seem to be raking it in... £150m last year.

[AJI]

http://www.telegraph.co.uk/news/uknews/road-and-ra...


1.5 million individual details sold by the DVLA to private parking companies enabling them to rake in £150 million.

Alternative was clamping which gladly is now outlawed.
But even so, that's some revenue being generated from the willingness of motorists to pay up on such civil matters.