Kent, thank you very much for directly addressing my questions...much appreciated.
I had already read the Bella Toscana website, but there is some speculation even there. I was hoping for more personal and relevant experiences, but I concur that people who don't pay aren't readily advertising that fact (especially not with the self-appointed high court morality justices on this site).
Norma/Michael, entering the ZTL was not pre-meditated, so you can set your troubled minds at ease and your gavels down.
Our guidebook addressed the general problem of navigating a car in major cities, but did not mention the ZTLs, so I had no knowledge of them, nor do I speak/read/write Italian.
Also, my statement in my original posting is a little misleading. It would have been more apt to say that I suspect the tickets were when we entered/left a pay parking lot based on the timing of the tickets, and the fact that I can fairly ascertain we were in Florence that day.
Thus, it's difficult to establish innocence for an infraction over a year old and since it is quite possible that I entered the ZTL, "I'm not sure" doesn't translate to a legal plea in any language.
Regardless, ignorance is an insufficient defense for breaking the law. In fact, the citation actually states not to appeal based on ignorance...so there's your answer for why I don't appeal.
However, I also agree that not paying an infraction is a valid form of protest.
After unwittingly entering the ZTL, I was also forced to unwittingly leave it. Without going into my personal beliefs as to when a fine becomes lucrative instead of punitive, I will say that I wouldn't even be on this discussion board if I'd received only 1 ticket and had established that I was in Florence in a rental car that day.