I have never really thought about campaign negative keywords too much until I managed the Adwords campaign for a Small Shoes site called Daintyfeet

You can waist clicks and money on keywords that really don’t have ANYTHING to do with your site.

For example for the Hairfreax website these would be keywords that my Ad’s are showing for but have no relevance:

Hair Loss Treatment
Hair Dye
Animal Hair

But these keywords might still cost me impressions and clicks due to the fact that a large proportion of my keywords have hair in them at some point!

In all fairness I am only loosing a few pounds to these keywords a month but that’s a few quid too much!

The most important factor in constructing an Adwords campaign is RELEVANCE. Keep the structure of your campaigns in tune with your site structure and make sure you eliminate any keywords that are not associated with your product/purpose.

Create Ad variations that are specific and point to specific areas on your site. You will get better conversions this way!