Another thing, it is wiser not to bid for the top spot for two reasons: 1) It is very expensive and impractical, and 2) Surfers usually try different search queries in various search engines before they settle on the right one that fits to what they are looking for. This hardly results to conversion. Try to bid for the fifth spot instead and work your way up.
If you are now going steady on your PPC biddings, it is time for you to develop your own bidding strategy accordingly. It is important for you to track down which sites bring the bulk of your traffic and identify the ranking of your paid ads. This will help your bidding strategy to be effective and you should also decide where you want your ad to be positioned. Usually your maximum CPC will limit your choices.
Bid gaps (e.g. $ 0.40, 0.39, bid gap, 0.20, 0.19, 0.18) occur when there is a significant price increase to move up one spot in the PPC rankings. It is best if you take advantage of the bid gaps by filling them in so you can save up your cents to other bidding opportunities. Often there are keywords worthy of lesser bids to get the appropriate ranking on the list and produce a good number of clicks and higher conversion rate rather than bidding higher but having a poor conversion rate. You have to put in mind that overbidding too is not good but rather the best position for the most effective bid.