They charge $12.95 montly for subscribing to their site for viewing solutions to questions posted, take a look here for example. Now only if the solutions were not available on the same page, scroll to a third of the page to see the answers. Now this is utterly stupid, I am seriously wondering if they have any subscribers.

Still, I certainly hope to keep the solutions free (they could hide them better in the HTML source or something :) to filter out the users).