Apparently they actually hinder matches unless both people are paying. Some of those prices are laughably ridiculous, like Tinder's $40 for a 3 hour "boost", with no indication of effectiveness, and sadly prey on desperation.
I'd love to see a modern service that aims to meaningfully connect people instead of perpetually preying upon them for cash.
On the other hand, the dating industry may be like the lightbulb cartel; if you're too effective, your customers will no longer need you. :)