A cultural point of view:
If I'm on a club outing and am asked to dive with a n00b, I'll happily oblige. Because when I was a n00b, I learned a truckload of stuff from older, more experienced members who were willing to dive with me and mentor me. When I'm doing the same thing now, I'm quite happy to pay back that debt to my community, at least as long as it doesn't happen on every outing. Besides, I think it's rather fun to help n00b clubmates to become competent buddies whom I'll benefit from in the future.
If I'm on a vacation paying for a dive, I'll be quite a bit more reserved about providing free labour for the op I'm paying to dive with.