Alternate-universe-me disagrees with you.
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It’s easy: No one wants to visit those timelines where the Nazis won.
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Well, we’re definitely in one forked-up alternate, then.
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Someone left our dimension in the oven too long.
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Time traveller jokes aside for a sec, I’m surprised to see no Sci-Fi geek has popped in with this classic possibility, which I’d place at #6 though you could argue that it’s just good hiding:
TL;DR: a technology where people see the past but can’t change it. In a way, they are visiting us but we are not visiting them.
Most people assume time travel might be an interactive endeavor but what if it wasn’t.
Or perhaps a #7: simply, that there is nothing to change?
/More things in the universe than dreamt of in your yada yada yada…
// List of 5 pfft!
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Object-oriented time travel.
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If you like that, you’ll love this.
Wobbly wobbly timey wimey; or Quantum Leap. Or both at once 
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Another possible answer to “where are all the time travelers” is definitely: on NCIS new Orleans
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Everybody in the 80s was in Miami Vice, it makes sense that they’d all end up in another cop show.
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Wow, I just realized I wrote a time travel short story.
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Perhaps Heisenberg’s Uncertainty Principle will be eventually realized to mean we have to pick one or the other.
Anyone who believes in reincarnation (I prefer multi-incarnation) believes that we all are doing this. My view is it’s all happening at once, and some of us are more aware of that than others…
What you have there is the essence of Advaita Vedanta.
Formally it’s called the Novikov self-consistency principle…
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That reminds me of Connie Willis’ novels about the Oxford University historians who time travel to do field work.
To Say Nothing of the Dog Is a much lighter book on the same theme, referencing Jerome K. Jerome’s
Three Men in a Boat.
(Of course if time travel were real, historians would not be allowed access to it because of the arguments they would get into with the locals.) 
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Where are all the time travelers?
Obviously, they fled our particular horrible ‘time’ out of pure dread.
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I’ve read To Say Nothing of the Dog… I’ll have to read Doomsday Book, too.
The time travelers in Orson Scott Card’s Pastwatch are essentially observers of the past, until they decide to intervene to improve their chances of survival:
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