Mark, you already offer some excellent information/guides/insights for free. Charging for anything on line is very difficult; just look how the newspapers struggle to sign up readers. Nobody wants to pay ??…. Some lateral thinking required but I’m sure there is a way.
What weakens the site is the forums section where most of the “good” posters have been chased out by trolls and Spanish haters. Anyone browsing your site would not be impressed and if anything not progress their interest. Good luck !! what about opening a real estate office in Barcelona? and then ramping it up on the coast??