Usually because of the ad revenue. If you look at those saling listings, they usually detail daily unique, member activity, and ad revenue. It isn't uncommon for a forum to make over $1,000 in ad revenue, monthly. A great board can make enough to make you drop your day job.
It's all about the ads, and people sell the boards when they don't want ot manage them anymore, thus others buy it to make long-time revenue, promote their products/services, and sell for higher as time goes by.
Also, it isn't easy to make revenue off of adsense, you've got to know how not to annoy your visitors and members but still have the ads be noticeable.
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