Well, of course they do. And don't. It depends on what your definition of work is.
Anyway, John Honovich is exploring the topic, with attendant poll, and you can see my comments on the matter at his site.
This blog, by Paul Ragusa, the editor of Security Systems News, offers thoughts, news, and a forum for discussion for those who work in and around the physical security industry, integrating and installing security systems in North America.