[Mericet]

1. The motivation to publish depends on the person writing. For some it is to make money, others just enjoy creating and want to share it. Others like to share knowledge. For instance, I write my blog for these reasons: To share my work and experiences with others (especially my family/friends in South Africa as they have no other way to see it), to show potential employers I can do more than just be a gunsmith and lastly, because it gives me enjoyment.

2. Some should, others should not.

Bonus: this is very subjective and will vary according to subject matter and motivation. Remember, sometimes people just follow something because it is really bad. (Thinking really bad sci-fi movies for example)