I think we all know the variety of player to blame for this and the reasons why it happens, sadly there is no solution other than to not buy their overpriced junk, be patient.
The issue stems from players having no idea of the true value of items and only knowing that they "want it" or want to "get ducking rich".
Heavy coin users/sellers- whatever, that's cool, it's their money, like so many aspects in mmo it mirrors real life.. Just dont be dumb and overpay, if you do you are encouraging these rises in prices. If you walk into a grocery and see some delicious apples priced at 67$/kg are you going to buy them simply because they are the only apples in store?
What I have always hoped for is a shop free server.