Our project is definitely open-source, but has an LF sub-project with a pretty decent amount of funding. We've been playing with the gitlab functionality, and

Our project is definitely open-source, but has an LF sub-project with a pretty decent amount of funding. We've been playing with the gitlab functionality, and was thinking it would be good to support a fellow open-source project financially, since we can. But to move to one of the licensing models on their pricing page requires us to start to pay per-user. How many seats should we buy? I have no idea. Right now, if someone who's given one or two drive-by patches wants their own space on the project, we just give it to them. If it cost us an extra $50/year (or $240/year or $1200/year depending on our tier) for such users, what's the cut-off for who gets to be part of the project? It just changes the whole calculus.