Adult dating and sex services
As much as they would love to fund your casual sex experiences (and they do to an extent) they need help to keep the sites up and running. This helps them pay for website hosting, employees, technology, and all that other fun stuff you can do on the site.
Another thing that’s great about paying for a membership is that it weeds out all the jackasses and the people that aren’t serious about hooking up.
In fact, it’s quite common for most to allow you to join for free and even create a profile.
However, I strongly believe that you get what you pay for.
I was just sick and tired of people asking me time and time again which mobile dating sites were the best and which apps got me laid.