When would this be useful? If your site has a blog with public commenting turned on, links within those comments could pass your reputation to pages that you may not be comfortable vouching for. Blog comment areas on pages are highly susceptible to comment spam. Nofollowing these user-added links ensures that you're not giving your page's hard-earned reputation to a spammy site.
First and foremost, when it comes to marketing anything online, it's important to understand how money is made and earned. In my phone call with Sharpe, he identified several items that were well worth mentioning. Once you understand where the money comes from and how the industry works, you can then better understand how best to position yourself and your offer so that you can reap the benefits of the making-money-while-you-sleep industry.
The actual content of your page itself is, of course, very important. Different types of pages will have different “jobs” – your cornerstone content asset that you want lots of folks to link to needs to be very different than your support content that you want to make sure your users find and get an answer from quickly. That said, Google has been increasingly favoring certain types of content, and as you build out any of the pages on your site, there are a few things to keep in mind: