Why don't they have anyone working in these sort of booths?
[http://uk.news.yahoo.com/4/20090219/tuk-girl-suffers-serious-sunbed-burns-dba1618.html]
I have never used one, but it seems shocking that no-one can ask your age, you can place money into the booth as much as you want, and all too save some money for the company.
(It's also pretty local to me).