for those of you who may be difficult to compete with affiliates around the world should start to select programs other than adwords ppc, such as having 7Search competitiveness similar to awords, as with the other PPC programs you can mimic the ads that have been displayed in adwords by the affiliate that exist throughout the world
PPC services can cost a lot of money. optimization of your site is necessary. U need to optimize your site for getting organic traffic.
If you do not set your spending limits on Adwords before you have something that converts well, you can run up a whole lot of expense. The other thing is to really limit where the ads are shown. I had good luck with Adwords several years ago, but now the cost is just more than I can make on the offer so have a negative ROI. That didn't last long before I paused that whole campaign.