Not sure there would be enough time to get a tan in a booth. They would have to start gradually to get a base tan, and be careful not to over expose. Took me about a month to safely get a good base tan, and I don't have a pale complexion.
The spray tan won't offer any protection from the sun, but I'm sure they want to "look" tan. I can understand not wanting to look like a light house beacon on the beach.