Now if they were to offer a token reward of even £50 then they would still be ahead as they would catch them all pretty much.
Though imagine what would happen if traffic parking enforcement offered a commision to the public who reports such violations they see. Traffic wardens would be out of jobs and everybody would park much better in the long-run and many people without jobs and spare time would have a better quality of income.
The problem with HOAs isn't the soccer moms enforcing stupid rules, it's that stupid rules are in place to begin with. Likewise, the problem with parking enforcement isn't the enforcement, it's the stupid parking rules they enforce. Fix that, and citizen reporting is perfectly reasonable. (After all, we do it for all sorts of other crimes.) Don't fix that, and dedicated enforcement is also bad.
I could fill a stadium with people who, if they saw a Time Warner or Comcast truck on fire in the street, would with great urgency and celerity rush past their fire extinguisher on the way to the bag of marshmallows.
I'll report the guy who cheats the distribution channel the day after I see a monthly bill that I believe treats me fairly and respectfully.