You don't necessarily have to have "smart" friends but it is a good idea to always include people outside your domain that might bring their own ideas. It avoid

You don't necessarily have to have "smart" friends but it is a good idea to always include people outside your domain that might bring their own ideas. It avoids the issue of you drinking your own kool-aid. Similar to http://en.wikipedia.org/wiki/Groupthink http://en.wikipedia.org/wiki/Groupthink