Easily the most iconic privately funded organisation associated with parking tickets and enforcement would be the Queensland (Australia) Surfers Paradise Meter Maids :

> Unlike other meter maids, who issue parking tickets to motorists when they overstay, Gold Coast meter maids put money into parking meters which might otherwise expire, preventing vehicle owners from incurring a fine. After the introduction of pay-and-display parking meters they took on the task of explaining to motorists how the machines work.

Say what now??

> The Surfers Paradise meter maids were first instituted by entrepreneur Bernie Elsey in 1965, through the Surfers Paradise Progress Association, which was opposed to the introduction of parking meters by the Gold Coast City Council.

[0] https://en.wikipedia.org/wiki/Surfers_Paradise_Meter_Maids