Advancing your film career is somewhat a balancing act. Nothing makes you an easier mark for exploitation quite like earnest ambition. Veterans of the industry will always tell you to never do any job for free but when you start selling your services for a living wage, if you haven't shot that exact video ten time before, the market seems to laugh at you. Or worse, the phone just never rings.
Here's the thing the veterans will never tell you. That is, if you let money be your guide you'll end up with clients driving your career. I don't know about you but I don't want that. You'll do the same shit over and over again. Your work will suffer. You'll loose out on jobs that really excite you.
So you gotta give them a little more than what they pay for. You probably shouldn't go overboard on every project but if you see potential in a project, don't be afraid to go the extra mile. They might be paying you $600 to do the job but if you can make it look like they're paying you $1200, you're doing the right thing. So go ahead and rent the right camera for the job. Offer to put in a little extra time. They'll appreciate the effort and it'll pay off in the picture.