I use another off the shelf script for a single gender dating site. The script does not have as many features as dolphin but it has what I call 'stable' features that earn me money (approx $3000 a month) = and those are a) spot on location search (POSTCODE/ZIP/RADIUS) and c) upgrades to see adult moderated content added to the site. Sites need to make their creators money, hard money, and also keep on the right side of the law (moderating content which can be used as a tool to earn money)