Perhaps your own history and how you see yourself plays a more signifigant role in this than anything else. I wanted to be a professional artist from the time I was a child and studied art in school. I ended up in the construction industry all my working life. Now that I am retired, I have the oportunity to fullfill my dream.

There may be an interesting deep psychological aspect to all this and how you perceive "yourself". My goal is to be an artist, therefore selling my work to me is the natural course to take. I do not see myself as a teacher persay, It is not my personal identity. So if I were to create a tutorial it would not occur to me to sell it, but to offer it as a freebie, a jesture of goodwill to the community. Many people do sell tutorials, in fact I would imagine its a pretty big industry. Someone previously stated that there is a "goodness" associated with giving items away, I feel that way about instruction, advice, and tutorials, but not actuall product that I have created. People who primarily see themselves as teachers ( their personal identity) would probably be far more likely to "sell" their instruction.

Think about musicians for example, musicians dont dream ( I would imagine) about playing free shows at the local Friday night social. They dream about playing at Madison Square Garden or on Tv. Being payed for what you do carries with it a certain level of or feeling of accomplisment.

I'm sure that how we see this issue is based on a lifetime of experiences, probably many Freudian aspects as well. As a person 60 years old I have observed in my lifetime that people can see and interpret things in dramatically different ways, it is what makes us individuals.