We too rent exclusively with Avis from multiple areas in Florida 3-5 times a year, because I too get corporate rates that don't compare with the other companies. I think the word "scam" implies they did it on purpose. Why couldn't it have just been an over sight? The people who are cleaning and checking-in the cars don't really care if you use the auto-tolls or not. The person who had the car before may very well have used the transponder, thus it was left in the on position. I don't think there is a scam!
gmeh1--There may not be transponders in EVERY rental car, but there is a means to capture those unpaid tolls. By not having a transponder is where the trouble begins. I received bills from National for unpaid tolls because they captured the plate number. However, I stopped at every single toll booth and had receipts to prove it. Then there was the bill that came for tolls at times I was not on the highway...that was the scam with rental cars and tolls a few years ago. I'm not saying the transponders work perfectly, but at least the renter has the option to turn it on or off. If one finds it on and doesn't want to use it, then they need to turn it off.
Hon, I can't see how much more "on purpose" it can be to have something that has a posted price of $1.25, and then to charge an unsuspecting customer either $4 per day in addition to the posted tolls and/or to consider buying something (a transponder) for $25 that has absolutely no utility when the customer is at home. I can just see it--packing for FL next time, and looking for the transponder. If the whole concept of this doesn't sound scammy or fishy to you, fine. For the record, I have been driving for 40 years, and I have never had a parking ticket, or moving violation, or failed to stop to pay a toll ever, anywhere. Really, I am a law abiding person, but it sticks in my craw to have to pay an additional $28 for a 7 day car rental for a total of $5 posted tolls. By my calculation, that's a 640% mark up. If I posted a price for my services, then forced customers to pay 6.4 times as much, I'd go out of business in no time.
The original intent of my posting was to warn fellow travelers of this situation, nothing more or less. I was trying to help people who possibly don't live in FL or a state where they have transponders. I see on this board, within the past few days, that other people have made much the same observation that I have. One person rented from National, and was charged an additional $37 for the duration of their rental.