The planet partners are the ones who would like there version of tools, weapons, and whatnots. This helps with the uniqueness for each planet and many times follows a story line.
In the end, these planets are just seperate games within the universe we call Entropia. Once the PP's start their advertisments, each planet will have enough people to use these items. For me, I have found that some of my old items are not as good as the newer ones coming out. I for one use only the Arkadia weapons atm. I will see what Cyrene has to offer when its fully online. Then when Toulan and Theyron Wars comes out, I will check there tools and weapons.
Also, when im on any spacific planet, I leave the stackables and other things there. I find I really don't need to bring the ores from Cyrene back to Calypso, or other planet ores to any other planet.
Maybe it's just me.. I do understand what your trying to say. It would help the economy alot more becuase as of now, there is more supply then demand. It's about the seperate games. I think it's still hard for people to understand that is what the planets are. They are their own seperate entities. Maybe the suggestion of having each planets own markup history would help alot more. Not sure..