Well, there are exceptions to every rule...
If you want to look at the whole picture, think of it this way: Police departments require X $$ to operate per hour. Police departments generate y $$ through traffic fines for a given number of hours of work (less than their total shift). If you look at the total cost of operations during traffic enforcement, and then look at the total funds generated from those hours, you will almost always find that traffic enforcement is one big black hole into which money disappears out of the department.
I stopped a rather affluent older lady sometime last year, and she told me, "Well, I realize that these towns have to get their share of money from honest citizens too..." I just laughed at her. I was still laughing as she pulled away. Some people will never get it. The $105 fine she got (more than 30 MPH over the limit, IL has some of the lowest speeding fines in the US) was nothing to her- she was driving a brand new Cadillac, didn't even have the plates yet. Good thing that we have a 3 moving violations in a rolling 12 month period suspension law in IL. That will get her attention when she can't drive that shiny new car anymore.... lol
EDIT:
"We try to have at least one officer patrolling the highway around the clock. It is a dangerous area. About 25,000 cars come through here every 24 hours. That is 9 million cars during a year." That was from the article you quoted. So, out of 25,000 cars, the officers are stopping, at most, 84 per day (28 * 3 shifts, 28 comes from the article also). I have no problem with that figure. Hell, if they had more officers, they could likely stop a hell of a lot more cars. All people have to do is follow the law....
Oh, and I have yet to have a month in which I have written 28 tickets. I suspect the majority of officers have similar statistics.