Here's another tool for teachers that I have been involved in developing. Sharing Links http://www.sharinglinks.com is a social bookmarking site for teachers.
Being able to find something for free in a forum or blog does NOT make the information not worth paying for.
Buyers pay for convenience ... for ease.. to save time ... even to HEAR again (one more time .. so maybe it will sink in) stuff they already know. All of these can be valuable and worth paying for.
If I get one small idea in a $200 ebook that improves my business 1% ... than that book was a BARGAIN .. and worth far more to me than a measly $200.
So what if that information could have been found in a forum? I wasn't looking in the forum... I was looking for an info product.