Its a bit like how long is a piece of string, depends totally on what you want to do and what people are willing to do it for. If you can get someone to film for free etc like a student who wants some showreel material then thats a good way of going about it. If you were to pay people it would probably be too much of a cost for a small band to pay out.
Roach productions are not taking any money from us, they did the nasa vid for us as well. We've put in some money for budget, for things like make up, props, food and booze on location etc. The make up team are also working for free and will take away any materials left over for their own use.
Basically it'll look good on extras/makeup showreels/resumes and everybody is using each other to get something out of it.
Roach like working with us and will hopefully get some exposure for themselves for doing it. They've done some great work already, check out their website.