There's a difference between exclusivity and loyalty. I can understand why some companies prefer a crew member to work exclusively for them. However, in my part of the world there simply isn't enough going on pyro-wise for me, as a freelance firer, to throw in my lot with one company. Consequently, I crew for a handful of different ones. None of them are under any illusion that I crew exclusively for them, and are happy with that. When it comes to information which is in any way commercially sensitive, it's a simple matter of confidentiality. Of course I'm not going to start disclosing that sort of information from one company to the owner of a competing one - doing so would be a bit silly, and would jeopardise my chances of being asked to work for them again if it became known that I couldn't keep things to myself. In my 'day job' as a freelance theatre lighting programmer/technician I work for many different clients - there's no reason why my secondary income from fireworks can't operate on the same basis as long as the client is happy.