You may think that a wider audience dating service is the way to go (i.e. Match.com) but you'd be wrong. A niche dating service allows you to better target the paying membership with content that is targeted to them, is helpful for them and they can relate to and ant to share. This will also allow you additional revenue opportunities to sell products relating to the specialty dating service you run.
Every successful dating service sells ad space and/or additional products of interest to their members. Think of this as the gateway to your unlimited income potential.
Think of your personal passions and use that intimate knowledge to create content that attracts attention. Are you a style maven? An ardent reader? A great cook? Can you give people advice that truly understands their issues and offers reasonable solutions? All of these things, and more, will help you to create content that attracts positive attention and increases your revenue outside of the dating membership channel.