Subtle ways for increasing tax revenues...

A time ago, I don't know how long, Seattle started putting out the "pay at the parking kiosk" for time to park on the city streets in many areas. This was to replace the parking meters, ostensibly to reduce costs to the city. I think that it was a subtle way (maybe not too subtle) to increase the revenue the city collects. "How?", you might ask, or you might not care but, I'm going to tell you my idea anyway. When the parking meter was fed, one might use all the time on the meter or leave a little early or late (and get a ticket), those that left early didn't get a refund on their time but the next person to park in that spot didn't have to pay as much for their time. I liked it both ways, leaving early and giving someone else some free time and getting a little free time from someone else. (What? You say that that was unfair to those who never found those few minutes... Life is unfair.) Now, if you use the kiosk, you not only do not get a refund for paying for more time than you used, the next person to use that spot doesn't get any benefit from someone else's early leaving. Hummmmmmmm..... If you purchase two hours worth of time and use 90 minutes you have just increased the city's coffers by 30 minutes rental of the parking space that you didn't use and no one else could use it either. The next person to use the spot had to pay for their estimate of how long they would stay and if they were incorrect in their estimate and stayed less time... ka-ching!!!!! I wonder how often this happens at the controlled parking spots around the city... A double whammy for the city, lower costs for collections of parking fees and higher income from inaccurate estimations of duration. Don't you just love it?