How does random stuff affect the economy?

So Uhm.. Seen some funny drops and rises in prices for doing some RANDOM stuff. Okay here's some examples.


All demonic sets:
So I was pvping and talking about how low drops are in glyph at Nuri's. So we talked like 2 hours long. Next day bammm prices shot up.

Green ice:
I make a guide and log on to see they've risen 150k...

Tourney:
Tourney starts and everybody is at my awesome gear which is no longer on cs....


So Uhm... Coincidence? What's up? Are there devs monitoring the economy =o runescape ahhhh!

I would say a no to that.

Would be same if I said that the increase of different guides was because of my "How to look" - guides.

It's just a simple law of cause and affect. No people farming Nuri - no drops - prices get high, like that.

and yes, I suspect that the others were just coincidence.