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.