I'm curious to know how Market Samurai, Long Tail Pro and other software handle retrieving the top 10 Google search results and not running into limits. It appears that these software packages use the users own Google account. Google Custom Search limits users to 100 queries per day (the free limit) but people tend to do keyword research on hundreds or even thousands of keywords per day and don't pay any additional amounts to Google.
Are they paying extra for this service, are they using a different API (perhaps the Adwords API?) or are they scraping the Google search results page (violation of TOS)? Really would like to know! Thanks.