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Parking tickets are much more reasonable to delegate than a moving violation.

You don't have to stop the violator, because they're usually not present, and you can leave the ticket on the vehicle.

The circumstances that lead to a finding of violation are subject to less dispute. Cyclist claims light was green, citizen enforcer claims light was red, is harder to prove vs parker says time was 5:30 and citizen enforcer says time was 4:30. Some parking tickets are more sensitive to location -- if the vehicle is very near the boundary between acceptable and not acceptable, perhaps an escalation to a sworn officer is in order, but parking in a red zone / parking in a bike lane / parking in disabled without a visible permit is usually clear cut.