Would I do Pro Bono Work?

I believe that I don’t have an obligation to do pro bono work because it is silly and a waste of time. Why would I want to bury myself in work that I wouldn’t be getting paid for when I could be making mad money doing something else. Granted though that if it were for a charity event that I believe in or it was for a friend or family member then I would consider either do it for free or depending on how big of a job, giving them a discount. Its not rocket science I just think that it wouldn’t be fair to me if they decided to offer a job that they think they could get it for free. I don’t work like that if its worth the time and effort to think of an idea, and if I agree n the idea then it will cost them time and effort.