See CP post as to why it is more expensive to install them now and also consider the fact that the tickets will also have to be replaced with ones that will be recognized by the turnstiles. Do you see now?I don't really see how installing turnstiles is more costly now than when stations are originally built, really. Some wiring might have to now be installed in the floors or something, but really it's the cost of the equipment for the most part.
Ok, they are barely skilled and not completely useless but comparing them to flight attendants is just silly.They do make $30 an hour and have a pension and benefits. They are not unskilled and useless. The public and the employer rely on them to handle crowds and to be reliable shift workers, and not everyone can do that. They're in a situation comparable to flight attendants, their job is safety of the travelling public.