[andrepd]

On the other hand, no charges mean you can get rid of a lot of cruft: no tickets, no gates/turnstiles, no machines, no payments, no paperwork thereof, no ticket inspectors, etc etc. So in fact having 0 charge is unequivocally better than having a residual charge.

In other words: charge price = cost, or don't charge at all and get funded by public revenue.

[bluGill]

In every city I know of, the fares for public transit more than pays for the cost of collecting. Also, in every city I'm aware of, even the ones with high transit ridership (Tokyo), there is lots of room for adding more transit and getting even more people on, but money is lacking to do that.

I'm also aware of no place where people who use transit to consider cost one of the major barriers to using it more. The barrier, even for the poorest people, is almost always not cause, but the service just doesn't meet their needs. Which is to say most transit systems need to raise their fares a little more and use that extra money to give people the service they actually want.