Online dating is a big business. Players like Match.com, Plentyoffish, eHarmony, an others invest and earn millions of dollars targeting singles all over the world.
You don't need million dollar investment to start a dating site. You only need to target real audience and offer good environment on your site to retain and convert your traffic.
There are a lot of examples of small successful dating sites that target specific niche or geography and manage to stay relevant and profitable.
Now, starting a dating site is much easier than before. OpenWack offers good tools for online dating sites both free and subscription-based.
You need to wait before we have OpenWack platform and any dating site software plugins in place to show. Until then you can check professional dating software by SkaDate.