The most important key to have profitable list on facebook is to add with people that is passionate about your topic. Choose a fan page title that makes people can't resist to take action and see what inside. Don't waste time waiting trying to build your list by searching people interest on search engine instead, feed their interest through fan page. Once you have it, it will become unstoppable and continue to grow dramatically. Their friends and friends of their friends will share your page and boom.. you got it!!!!
Please, any suggestions and ideas are welcome to share.