To get a good search enging ranking for highly competitive keywords is not easy , but if you achieve it it can bring you a lot of profit in ruturn and thats the reason why some companies pays heavily for SEO companies to rank better in search engines. This is true for adsense bids and similar bidding services as well because everybody usually bids for highly searched keywords. English is a bit tricky language for who use it as there secondary languaege and there are people who are making good money taking advantage of that fact.

online poker , online gambling , casino poker are very popular search terms and what are the chances of someone typing "online kasino" when he actually meant online casino , well in some countries the chances are quite high and marketers are taking advantage of this fact through geographic targetting enabled through different ad networks. Although the number is less than the correct search term because of its uniqueness he marketers can get super cheap deal for words like that. So if you can think of some tricky words like that this could be good time to start that geographic targetting.