Here is my last period for Fling (first half of july):
Hits: 19657
Registrations: 363
Signups: 32
Earned: $1120
Registration Ratio: 1:54
Ratio: 1:614
Definately a slowdown this month, less hits and worse ratio so far, but overall they do really ok, especially compared with other dating sites.
Keep in mind that it takes a few periods till you'll see steady conversions from free to paid signups. Loads of people signup for free, check out the site for a few weeks and upgrade to paid once they are confident that the site offers what they are looking for...a little different from the "normal" paysite.