What decided it for me with Zoosk was whether people reply or just collect matches.
Gave that one a fair run over 6 weeks and kept coming back to what the free ceiling looks like in practice.
If you care about how many profiles logged in this week, that alone should decide whether that one is worth it.
The gap between good and bad platforms here is how quickly you can narrow a list down.
Widening the radius on the site added volume and quietly worsened what the real cost is after the trial.