You will get max clicks if your landing page quality is grate and display text is attractive to click also CTR. Your campaign performance is not that much related to you budget.
Your ad should have high quality & relevant content. Besides you have to give proper keywords to the search query inorder to determine what phrases your customers are actually searching for. Always try to find new keywords. But remember don't change your keywords & making variations to your ad at a regular basis. If you are using Google Adwords campaign then follow this link http://www.small-biz-marketing-tips.com/profit-from-google-adwords.html Please visit our website at www.manuallysubmit.com for any kind of SEO service & query.
So the chance of more clicks depend on the quality of landing page ? What if I am just using the affiliate link directly ?
It depends on your QS,and one factor for a better QS is landing page quality. Then you are for sure preparing yourself for failure.
So if you have a better QS you can get cheaper clicks.In adwords it is all about getting cheaper clicks,right? Here is all about QS you need to know http://adwords.google.com/support/bin/answer.py?answer=10215&topic=9354