Here's my takes on the Free Fare Zone:
How much revenue is lost to Calgary Transit?
Basically none; very few people are willing to pay 4 dollars to take a train for three blocks. On paper, there's a lot of revenue, but the value is only what you can get people to pay for it, which is very little.
What is the cost of the free fare zone to Calgary Transit?
Basically none; the trains are running and stopping anyways on a schedule controlled by the lights. Since the FFZ ends in the downtown, nobody is taking up a space that a paying customer otherwise could (since there's plenty of people at 7th and City Hall waiting to get on the train out of downtown). It's not like "free" as in beer, where providing it to more people means proportionally more cost. It's actually a very clever price discrimination scheme, providing extra service that costs nothing to people who wouldn't pay for it anyways. Win-win.
Can paid fares be enforced without converting sidewalks into paid platforms?
Nope; on-train enforcement is impossible when the train is stopping in 1 minute without a massive flood of peace officers; if a peace officer gets on the train, you can simply walk away from them, get off at the next stop in 30 seconds, and say that you threw away your ticket.
Can sidewalks be converted into paid platforms?
Nope; there is no space at City Hall in particular to handle both rush hour crowds and a separate sidewalk area, both wide enough to handle, say, a person using a wheelchair going one way and a person pushing a stroller going the other way. It also encourages people going around the barriers; it's a three foot climb onto the platform from the road.
Will removing the free fare zone reduce crime?
Not really; nobody who is going to stab someone on a train is going to balk at adding fare evasion to the charges. Also, essentially nobody stabs anybody on the trains; they're much safer than the roads. It will radically increase the petty crime of fare jumping, since it is impossible to enforce.
I meant "discomfort" when I said "crime"; it's actually that I don't like sitting near certain people on the train who creep me out. What about that?
Again, nope. The best thing for people who need help is to actually get them the help, which is beyond the scope of a transit fare scheme and is apparently not possible (even though it's the cheapest and most ethical thing to do). But in any case, if there are "uncomfortable" people on the train, the best remedy is to have more "normal" people on the train, acting as bystanders. The actual best thing to do to reduce the discomfort is to ensure a steady supply of all kinds of people; for instance, by making it free.
Are there any other benefits of the free fare zone?
It helps integrate our downtown that is long-but-thin; it encourages people in the Beltline and ends of the downtown to take transit and avoid driving in the most congested part of the city; it helps prop up the weak east and west ends of the office market. We should actually expand the FFZ by one stop in each direction (two to Erlton) on weekends, middays and evenings to provide more inner city economic activity.
I took the train with my wife to and from the Jube on Saturday (even though it was basically the same price and twice as long as driving). There were people who I wouldn't want to interact with in both directions, but the 10:30 PM trip home was a lot more intimidating since it was just us, one other person and whoever they thought they were talking to in that part of the car.