Disrupt online dating is something i'm trying to accomplish with http://cupick.com/ (I haven't officially launched it yet) One of the issues I had with sites like Match or okCupid was gender bias. Men get few messages from women and women get overwhelmed with the messages from men. My solution to this was to add a moderator (the public) to recommend and filter potential matches and who you can message.
Interesting idea, but it's highly unlikely that people will get involved with a dating site when registration is a requirement for even seeing the site.
Also, marriage oriented or dating sites for single ethnic groups often do the same (or have no gallery at all till registration).