Mailers from an organization calling itself the Florida Real Estate Board demand $225
Only 5 percent of members have claimed custom URL
Poll suggests 800,000 NAR members may register '.realtor' domains
ICANN grants Homes.com parent company oversight of '.homes'
Registry service based in Ireland would make .MLS available 'to all registrants'
Group's history enforcing trademark raises free speech concerns
Goal: Help consumers discern source of information of real estate websites
MLSs don't expect to submit application to Internet agency this year