Why is poe.ninja a trusted site for currency prices?

I am asking this because I am wondering if people that own the site can manipulate the game economy.

My question is what makes this site trustworthy and why?
This game has a "free market" trade system and I am starting to wonder who is controlling these sites because ex to chao crashed hard 170c an ex to 130c an ex thankfully I bought a doctor card with my reserved ex so I am mostly unaffected by this however each doctor card could be worth more ex now due to the lower chaos cost to ex.
Last bumped on Jun 29, 2018, 1:36:44 AM
the drop from 170 to 130 was possibly because of a recent wave of bans against botters:

https://www.pathofexile.com/forum/view-thread/2176707
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It's still 160c in Standard, so it's safe to assume Incursion will go back up

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