I see a lot of directory websites which the revenue model basically is rely on Link repo and premium link buy on subscription basis. Do people really buy these link (I wonder). I believe most of these directory websites are built by SEO companies to help pushing the ranking of their client websites in the past. Large directory like yellow pages and superpages seems still received tons of traffics but none of them can reached Alexa top 500 in most countries. Or perhaps Google itself is a very good 'directory' already? If you own a directory website, how's the revenue compare to past year?