He could be the ethical one? Without rent-gauging, there's still money to be earned. I do also assume he would play above the board, no sublet scams and pay his taxes. Riskier options exist too, but on balance require more effort, upfront cash and knowledge. Say, becoming a franchise re-seller, politics->consultancy, running a call centre, developing yet another CRM system, or outsourced services in general. I recall the shout about one guy cleaning ovens in this thread - stranger things can make money; find one thing people hate doing/spending time on, and do it; then hire people to do it for you; then live your life. Once you have some self-sustaining wealth, Buffett's advice of just parking it in an index fund isn't silly at all for hands-off comfort in later years. The OP can then dedicate his time and resources to building affordable housing, political causes and economic reform, at least at local level. Likewise, at the end of his life he can release all of his economic potential back into the system as opposed to passing it on as inheritance, if he so wishes.
Otherwise, a non-job on 27K should be sufficient to develop productive hobbies and other interests.