not really sure what 26k is.. guess its pking.
But sorry to my knowledge jagex dose not watch this forum.
Also jagex knows there are alot of problems with the game and have been trying to come up with solutions to make everyone happy (they have currently failed massively) But yes Merch clans are another cause to these problems.
But prices jump up and down always have only reason most notice now is cause they have a price listed below them or at Grand Exchange.