It is expected that you pay people for their work
Greg plans to sell his home, and is good friends with a professional painter named Nick.
Greg wants to hire Nick to paint his home, so he can sell it.
Greg pays Nick a fair price for each day that he works.
Greg has Nick painting for an entire week but never compensates him for his time.
Nick is happy to have been able to help Greg, and their friendship remains in tact.
Nick feels that he was used by Greg and never speaks to him again.