The definition that you and I posted precisely says money, in return for suffering, not time lost. Hence you compensate someone for an accident or libel, or you pay someone wages. You trade services (assisting for quality teaching), you don't compensate a service for another.
No it precisely says "typically" money - meaning not always.
I am saying in one way or another you are being compensated for your time. Either in money, beer, food, diapers, wine, knowledge or cigars.
Either way my point is: it is up to YOU and you alone to determine if working for something other than cash is worth it to you. When starting out, there are many things that are more valuable than cash.
I think there might be a good comparison with fishing. Would you rather get paid $50 to stand on a dock and fish not really knowing how or would you rather not have that $50, get to follow a professional fisherman for a few trips and then know how to REALY fish and use those tools for the rest of your life to make more money?