Tinder
OkCupid
PlentyOfFish
online.dating
Badoo
Match.com
eHarmony
Which of these does not belong? It's a fair question for the domain considering what he paid for it. Anyone paying that kind of money for a domain (whether he develops it or resells it) is obviously shooting for the stars with the project.
"Online dot Dating" as a brand has no soul. I suppose Match.com doesn't either, but that was built up back when keywords with extensions as part of the brand were common. Perhaps we will come back around to that in the future, but there are no indications of that at this time.
So I'm going with stupid purchase price on this one.