So what you're saying is YOU determine the price of a PD not the market and the demand? Give me a break. People pay what people want to. As for items that's a different story.
I don't care if an item is common or impossible to find. If it's useful and I want it, i'll pay what I like.
Why do you spend so much effort trying to police everyone and force the market to your prices? If people ask too much, someone won't buy, if people still buy, that IS the price. Get over it.
P.S. I forgot, if this is for the "new" people. Well then this is something that needs to be discussed with Larva. Drop rates or something need to be altered. We need to solve the problem, not the symptoms.