The first one I got really angry when I saw it, was an add-on a hire a cheap labour website, the add said something like.
I was intrigued, and decided to find out about the people who wrote the advert, they were a biggish SEO company.
Even more interested I applied for the job, and found out that this page with links, had been designed so every time it opened it would desguise the IP address of the person clicking, so each time the clicks were done, they looked like they were coming from a new person, in a different country.
I complained, but they said they had over 50 people from India that were happy to earn $10 a day, and if I didn't want to that was fine..... I wished later that I had gotten that list of link and contacted the website owners, to show them how all the new visitors their website was getting weren't real, but of course hindsight is a fine thing.
regards Lynny
The Honest SEO