Two weeks ago I had the idea to build a marketplace for Gumroad links. I called it <a href="http://gumb.io" rel="nofollow">http://gumb.io</a>. Since then it has grown to over 11,000 Gumroad links.<p>I think that amount of growth is a testament to the potential of Gumroad. I estimate total links at Gumroad to be greater than 15,000.<p>What do you think? I think we will start to see marketplaces like this pop up and fill niche marketplaces for Gumroad sellers.