being an affiliate to any website is not easy money... even porn. its hard work just like any job and may take years to pay off just like any business.
Some advice:
1) ONLY become an affiliiate if you get a cut of the ongoing subscription. 2$ seems a bit low to me.
2) What promotion materials are they going to provide you with?
3) Your best traffic will come off of search engines and only 2-3 matter...(you know which).
4) some people make a 100k a year doing the affiliate thing but they have spent years and countless hours working on it.
5) if you have money, you can buy payed spots and even buy traffic but making it convert can still be a problem.