Competing for popular ad words is expensive. Buying ad words that are well paced with these high-priced ones can be rewarding too. You can often get more click-throughs per $1 with these words as well.
For instance, you want traffic with users searching for KEYWORD X. The purchase price for that keyword is $1 per click. The purchase price for KEYWORD Y, which generates about 90% the click-through rates of X, is 75% the price of KEYWORD X. Dollar for dollar that is a better return.
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