I agree, but I also think you are looking at the stats the wrong way, too.
Conversion doesn't matter! What matters is RPC (Revenue Per Click).
When you look at the variables, some dating sites will have a better click to free ratio, some will have a better free to paid ratio, some will convert worse but their per sale is higher or retention length is longer; and so on.
The only fair way to compare dating programs (or pretty much any program for that matter) is if I send program X 10,000 clicks and I send program Y 10,000 clicks (of the same quality of course) - who makes me more money ??
An extra note especially for dating programs is, different programs count "free profiles" differently. Some credit it when a basic profile is filled out, others you must confirm the email first, others require a multiple page profile. Thus it's really not the same comparison at all.