In some ways the very low social skilled worker is better at the job than the person with higher technical skills. I know some people with Downs Syndrome, their employers hire them for greeter type tasks because they obviously unsuited for anything: it makes thing move fast when the public realizes they won't get anything out of the greeter so they have to read the signs to figure out what they should know. The public likes to know that otherwise "useless" people have a productive job and so public opinion of them goes up. The greeter like the feeling of doing something useful, plus the money in their pocket. Everybody is better for this. Of course someone has available to handle trouble makers.