Some day google pay for one click 1.3$ Some day google pay for one click 0.1 Why that distinction become? I know ads prices is diffirent,but this differinces are too much. You meet this differences too much?
Are these from the same page of the same site? If so, it could be because there is not that many advertisers for those keywords, so the prices drop off drastically past the first two positions. If not, then it is probably just the difference in the payouts for the two different keywords. Some keywords routinely pay above $1, while others pay <$.05.
Also, if your clicks do not convert for the advertisers then it possible that you cost per click will gradually come down.