This post may help anyone that encountered some difficulties in promoting their websites on Google Adwords.
Evidently quality score is no longer based on clickt-hrough. Following steps should be taken to improve quality score on Adwords:
1. Create Privacy Statement page (especially if you are an affiliate)
2. If you run e-mail campaigns make clear how your customers can opt out.
3. Create “contact us” page with as much information as possible.
4. Ad more content to your site.
Hope this helps.