The government is not a bank. You're not supposed to "get out what you put in" or "pay for what you use." The government provides things for the public good: roads, education, police, military, etc.
Of course some government is a Ponzi scheme in the sense that some people "pay for more than they use." That's called progressive taxation. So if the evil sprawlsters are subsidizing the older roads...so what? The evil sprawlsters can afford it.
It would be just as ridiculous to write an article about how "people with children in schools aren't paying the cost of the school" or good grief even "people who have a fire aren't paying the cost of the fire department." Roads are provided for the public good.
So it really doesn't matter that the author doesn't even address the fact that many of these supposedly deadbeat property owners are paying a whole bunch of taxes that are keeping the city of Ames afloat, along with its supposedly inaccurate road tax scheme.