Well,hopefully clever marketing will also allow people to rent
   out portions of our living brainspace as well. While the "only
   10% of the brain" is a myth (we use 100% of our brain) -
   nevertheless, I could see it being a source of income for people
   in the future, much as we allow companies to make use of our
   time when they show us advertising and such. Exactly. It's not
   "right" but it happens. As long as we live in a capitalist
   society.. and unfortunately I don't see anybody in positions to
   change it wanting to do anything about that, it's likely we'll
   _still_ be in some kind of capitalist society when technology
   catches up to our ideas expressed here in 2015.

   An example of how we do it now though: Facebook

   Facebook isn't free. It's paid for by advertisers.

   We allow the advertisers to take up screen space (and brain
   space because we see it) - in exchange for not having to pay for
   Facebook ourselves.   It seems normal to us now. Renting
   brainspace in the future will likely be a similar scenario. It
   will appear so everyday and normal that we won't even think
   twice about it.