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People who offer free help typically do so because they like to work on interesting problems

That's pure conjecture on your part. I rarely see newbies asking for help on interesting problems, yet I see plenty of people willing to answer their questions.

It's basically the equivalent of, "You just waste your time in that soup kitchen anyway, why not come cook me a meal in my mansion instead?"

No it isn't. It's the equivalent of, "you just waste your time in that soup kitchen anyway, why not allow me to come to the soup kitchen as well?"