there is a sample on the landing page!

This is a good example of where UX means a different thing to the user than to the developer. Just because it's available on another page doesn't mean the customer is going to take the time to go figure that out. Take these criticisms graciously and learn how your user's use your software it's going to improve your products immensely.

He's pointing out that there's a link to a full-size PDF sample of one of the templates on the landing page if you scroll down a little bit.

a sample.

I would love to be able to browse their entire collection with a mark indicating free or Pro.