some sites exclude web crawlers in general not only because of the advertisement, but also because it is resource expensive...
when a web crawler visit your site, it hits hundreds of pages in a minute, compared to a member who can hit 3 or 4 pages per minute...
i have on my site yahoo that crawl my site once per day, 58 to 100 hits per minute... and go after 10 minutes... i have 0 members... just infos... imagine a site with 1 million posts... yahoo would crawl the site like 1000 times the count i have... webhosts hates that...
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