[Action]
[Garden variety like pretty flowers, right]
Humans aren't outstandingly special in the grand scheme, but they're still quite lovely!
[She moves a piece in a very matter-of-fact way.] I'm very much formulating theories on the fly, here, but it could be due to its importance in the mechanisms of cosmic reproduction; as one of the planets housing a species that famously plays 'the game,' it may be a sort of time-space hub that is particularly attractive to our wardens.
Even if most of those here aren't associated with that game, it would make sense for it drawing so much attention, compared to other worlds with sentient life that don't.
Not that it explains the relative lack of trolls, or other species whom have played it... [Was that enough rambling for you, Helix.]