So, do you advocate tolls on EVERY road, so as to share the tax burden incurred in order to build roads throughout the state? Wouldn't that make freeloaders out of all drivers who do not use toll roads? Using your rationale, an entrance fee should be required to enter any government building because, let's face it, they don't build themselves.
Tolls lead to (more) corruption. You don't think any unconnected person is going to land a $40,000 salary (loaded w/ benefits) collecting quarters, do you? Nope, those jobs are for "friends." And you don't think those "reasonable" tolls won't increase frequently, do you?
Bottom line - the gov't has plenty of money. They just need to figure out how not to waste it.