I won't speak for Robert, but in general. Some ads pay only if followed by purchase, other pay if you click on them, some pay even if only seen on page. Of course, they pay in adequate proportion. An ad must be seen btw 100 and 10.000 times for 1$, one click can bring you from 1 cent to couple of dollars, one purchase ...
It is important not to click on own ads, or ask people to do it as a favour, because the advertiser will see through it and cut you off. If you really want to do a favour, click on an ad from time to time, but only if it is relevant to your usual on-line habits.