The exchange has a lot of tokens but its the first time I hear about most of them. I guess they are not very popular.
We support the idea that anyone should be able to use the exchange without any restricitions. On Ethen anyone can add a token to the exchange. To do that you can simply click on the drop-down list with tokens and click on +NEW TOKEN. After you paste in the token address the system will automatically identify the token ticker. It will appear on the list as 'Not verified'.