IMHO, flirting apps and websites all fail all over the world. All of them. And you cannot correct these failures by making the apps&sites paid, you get caught yet in other issues, such as unnatural shrinking of the prospects, diverting the expectations in the wrong way (money involved) and the huge # of unpaying people still interfering with the paying members.

Also not every member is a human! Many a number of profiles are fake, most of them unnatural, unresponding and the expectations clash all the time.

Any serious flirting application should find solutions to these issues first and that cannot be done by simply making it a paid app.