Looks like one of their selling points in the fact that it is "private". Taking a jab at sites like the DIS, they state that it is dangerous to post your trip reports online.
How, I am not sure. But that helps them justify their pay status.
Silly, if you ask me.
The DIS is a GIANT resource. You can not come up with something that someone hasn't already done here. And people here LOVE to share. This kind of free exchange has helped THOUSANDS save money, avoid hassle, and have a magical time.
Anyone who wants to charge for that would have to provide a significantly higher quality experience.
Now, they may be charging to help defray server and bandwidth costs, but Pete seems to be doing fine with that with Sponsors and Ads.
Ted