I know that but I was trying to point out that recent searches could be developed a lot lot more. Knowing what users are searching for is valuable information that could be exploited.Mr Happy you are completely wrong :]
First of all recent searches are not for the functionality and secondly a DDL site can perfectly get big without doing anything more than just putting it up. Gotta love Google!
And you do have to put some effort in. For a start you at least have to accept the submissions.