Although they're not as popular as during their heyday in the 50's and 60's, there are still a number of
drive-in restaurants throughout North America where you pull your car into a stall and order over an intercom. The food is subsequently then brought to your car, where you sit and eat. The person bringing you your order is called a car-hop.
One such chain still in operation today is
Sonic, and their gimmick is that their car-hops deliver on skates. Nowadays not too many carhops still use skates, but the company does still
sponsor a car-hop skating competition. Car-hops who do work in skates get a slight hourly wage increase over walkers. I'm not sure if they're allowed to use more modern roller blades or have to use traditional roller skates.
This is an
older video, but it shows the layout of a typical Sonic restaurant well, including the stalls.
So I'd say yes, it's a useful skill if can earn you more pay and/or prize money.
We have a Sonic here where I live which I frequent more than I should. I haven't seen any skaters lately, but I've seen at least one within the last few years. He seemed to be trying to learn how to skate though, because he wasn't especially competent. I'm guessing he was just doing it for the pay hike.