Easy. Just build more unsuccessful businesses.

Wouldn't they be successful in their failure if the goal was to give this list more data?

Building unsuccessful businesses wouldn't automagically add to the list. Perhaps building somethings that scrapes the net for relevant blogs may.

Add it to the terms of funding.

When you get a drug trial approved you're obligated to publish the findings no mater what happens. By analogy, investors could require a post mortem when they provide funding.

Apparently not: http://www.alltrials.net