Despite AdWords tips and guidelines, shoppers are unique and your well written masterpiece may not pull the click-throughs you’d expect. Some trial and error is inevitable. Remember that this is direct marketing and the better you understand your customer’s impulse purchase behavior, the better your response will be.

Start your bids high to see where the traffic is and to generate a few click-throughs so that your ad will continue to be seen. You have to be in the top eight bids in order for your ad to be shown appreciably. If you start your bids low, your click-through rate will be poor and your ad may be cancelled.
Vary your bids. If your click thru rate is getting down too close to .05 %, up your bids for a short period of time to get some click throughs and that will keep your ad active.
Bid on position three or position eight and you may have receive better ROI in these ranks.
Additional Google AdWords Benefits

Easy account management.
You can check your Google AdWords click through stats online at any time. They’re updated within a few minutes.
Google has an automatic bidding feature that keeps your bid high enough but only one cent above the nearest competitor.