I don't think the relationship should be linear - 2.5x the work for 2.5x the hours..
I think it should be more myself, which is why I said "at least 2.5x". That's a starting point - under that, no one's going to be interested in even talking to you about that kind of gig.
If it really is, the team that "gives their all" should be getting more than "attaboys" in return.
This is the real problem. Employment is supposed to be a business transaction involving an exchange of value between equal partners. If you're taking all my time, you're either going to compensate me fairly for what I've given, or you're going to have to find some other sucker to fleece. I had this conversation with my boss a few months back - she was chastising me for not putting in 60-hour weeks like some of the other folks, and I explained that when we agreed on a compensation package, it was with the understanding that it was based on a 40-hour week:
Mgr: "Well, you're on salary, so that means you put in whatever hours it takes to get it done."
Me: "Okay, so that also means that if I get all of my work done in 20 hours in a given week, I can go home for the week, right?"
Mgr: "Um, no, that's not how it works."
Me: "Uh, yeah, that's exactly how 'salary' is supposed to work."
I'm often labeled as having a "bad attitude" because I refuse to let management disrespect my time like that, but I'm still working after 25 years in the game, so I don't really care.