This comes at a time when an increasing number of Americans are trying to find partners online.

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Spark Network’s revenues fell nearly 22 percent from 2014 to 2015.

"There are about 4,500 online dating companies, according to a report by the market research company IBISWorld, but the majority are tiny.

That kind of connection rate would shatter Hall of Fame records, at least in baseball.

But the responses from the more active group suggest they’re highly frustrated. D., a professor at the Harvard Business School who studies consumer behavior, thinks so.

The largest player in the field is the Match Group, with 51 dating sites; over the last few years alone it acquired such high-profile companies as Tinder and Plenty of Fish.

“It’s never been cheaper to start a dating site and never been more expensive to grow one,” said Mark Brooks, a consultant for the internet dating industry who also runs Online Personals Watch.

When done right, these sites can be lucrative and require minimal effort to maintain.

Markus Frind, founder and CEO of Plenty Of Fish, says he brings in more than million a year (at least half is pure profit) working for just an hour a day.

"Some also see a move toward ever more niche sites like Mouse (Disney lovers) and Gluten Free (the name says it all).

But, when you slice the pie ever thinner, “you’re also slicing your membership base,” Mr.

Part of the problem, he said, is that 70 percent of internet dating in the United States is now on mobile.