Stockpiling for gold

Hi everybody,Levelling up i decided to stockpile all of my cloth / meat cooking items and herbs that i looted. Through levelling, i knew the economy prices would be near vendor price for quite a while.I'm almost at 60, and it seems that the price of e.g. silk cloth sells on my server at a rate of 25% above vendor price. Do you think this is likely to increase over time? Or will clothes and things stay very near to the vendor price in the future? I'm trying to work out the best time to sell, IE if in 2-3 months the price goes up by another 10-15% per stack then it's worth holding on to?At current server values, my stock is sitting at somewhere around 200gold.Cheers in advance.