Man, some of the childish, sophomoric responses in here… its when I read these types of responses, i’m reminded why Amazon outsources all their seller support overseas and could care less about the lot of us… to the few sellers in here who offered advice, cheers to you for trying to offer value.
To the OP, when dealing with PPC (pay-per-click) campaigns, micro-testing campaigns to get your conversion ratio as high as you can while minimizing the costs is the real trick.
• Always start with long tail keywords as their CPC will be the lowest.
• Be sure to filter out negative keywords and other discrepancies to ensure there are no wasted clicks.
• Set daily limits of no higher than 10$ when testing campaigns.
• Use googles keyword tool so you can pick keywords based of trends (go back 1-2 years but no more).
After you have done this and have managed to create a profitable campaign, THEN its time to scale the campaign by opening the flood gates and allowing larger volumes of traffic through.
There is always the notion that your product may not be in demand, priced competitively, ECT… but before your listen to pits of negativity and amateurism by some members (not all) in here, perform your own diligence and cross all the t’s and dot all the i’s during your “testing phases” as specified above to reach such conclusions on your own.
Best of luck.