[matth2]

I'd love to see a blog post that focuses on the 'barriers exist' point. Maybe some case studies.

I guess there are a range of levels of barriers to entry, and any example of high barrier to entry I can think of implies you've already done a lot of work yourself. Very often, this might be because of a previous job / study gave you some specific valuable domain knowledge, and / or contacts (eg google).

Other times not. For example, the sydney harbour bridge climb - there high barriers to entry here, they have a monpoly! but to get that monopoly they had to put in a lot of hard work convincing the relevant authorities to let them do it.