[MarkusWinand]

It is absolutely possible.

On the other hand: it's also possible that nobody would know me without the website.

Further: I've learned so much from free online resources, why not giving something back?

I know for sure that many people buy the book because they started reading online. Also: A lot of the training I do is sold because ONE participant has read the site/book and arranges a training for the department.

TL;DR: I works fine for me.