Jagex doesn't make the prices go up, the players do
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Bull ****. (self censored)
Jagex banned tons of autoers, these people had millions of gp, and phats etc.
Now there are less rares.
Rare prices go up.
Jagex makes prices go up -.-
(I'm not saying Jagex shouldnt have banned them

)
Jagex influences every single price in runescape.
Why is a bronze dagger worth 1gp and not 10? Because you get it free from tutorial island.
Why is a dragon hatchet, (slightly better than rune hatchet) worth 3 million gp? Because JAGEX made it so hard to get.
Ooh, guess what?
Dragon 2 Handed Sword this month, I wonder, the new monster, bigger and badder than kbd.. going to be so much harder to kill. Oh,

and its in the wilderness!!
I predict say, 25 million in the first few days, it will drop to around 20m. Then Jagex will realise theyve 'done it again' and do something to make it easier to get - reducing the price to 10m - ish.
BUT!!
If jagex hadnt have made ANOTHER mistake in making an item too hard to get, the price would have started at around 10m, and dropped to a reasonable price such as 3-4m (much like the whip)
But I do agree with one thing...
Jagex are hypocrites.