I agree completely. I have a two-step process for managing a portfolio of ideas: 1) develop a set of criteria by which to evaluate ideas so that you can compare them apples to apples, and 2) be rigorous and honest when evaluating your ideas. I use a trello board based on the following "idea funnel": https://www.dropbox.com/s/7zscq79ybhjrxni/Idea_Funnel.png?dl...
Worth noting that ideas aren't worth much without execution: http://nducoff.com/post/128443632/what-you-are-doing-is-not-...