They do say they don't currently sell their bikes. I remember when the dock-less bikes pilot ended, those companies sold their bikes for cheap, but don't remember ever hearing about CaBi selling theirs.

It makes sense to not have sold any second hand bikes as it makes it much easier to allow users to report the bikes if there isn't any chance someone could have legitimately purchased the bike. And arguably, if the bike has worn down to the point it's no longer fit for service, it's probably not safe to sell to someone.

Taking a guess here. Maybe in the past, when metro had more staff, the turnaround would also be the point where the train operator changes, giving the incoming one a break. With two operators, you could effectively minimize the time the train sits out of service as control changes from one end to the other.

But now with the staffing shortage, you're more likely to see the same operator operate the same train on the way back, meaning there's a more noticeable amount of time the train is "out of service" while the operator traverses the length of the train.