What do you mean by “the economics” here? I barely drive but I have a toll transponder, I set it up once and haven’t thought about it since.
I don’t even have a toll transponder, OCR these days is good enough to detect your plate number and charge the linked account.
Toll collection used to be much worse in terms of collection efficiency (revenue-cost)--perhaps 50% as I understand it. With all the automated toll booths I assume it's much better today.