Let's not get hung up on definitions here. It doesn't really matter if $10/month is a job or just a hobby to you. The important question, is whether or not it is attainable with low effort as you seem to suggest.

I've built a few websites with pagerank 2-4 where I spent more than 20 minutes every 3 days and enjoyed it. All of them have netted less than $10/month over a span of 5 years.

This experience has led me believe it is not possible to even get to $10/month without treating it as a job...unless you happen to enjoy blogging about acai berry and prescription drugs.