[fatbird]

At a guess, there are two reasons: First, they don't need to offer gross points to get people invested in working on movies, because they already have a steady stream of people desperate to be involved in any way just to be involved or to build experience or to get their big break; and second, if they don't have to, they don't want to because it's less money for them and it establishes a norm of people taking some real money home (a norm that's unnecessary because of the first point).

I was, for a while, peripherally involved in the Canadian film industry, and even in that stunted and low budget arena, there was no shortage of warm bodies to fill any role at all, for virtually nothing but a credit or a line on a C.V.