my take on it.. over pricing on the sellers part, is just a common sales practice... anyone who sells anything does it... there is logic behind it also... example.. i am currently trying to sell a car, any time someone asks how much i want for it i say the same price every time $2500.. what i'm not telling them is i want $2000.. simple reason being, someone might think it's worth $2500 or even be willing to pay more for it(how am i to know), some people probably think i want to much for it.. but that's for them to think(they have the right to an opinion), i don't care if they think it's worth it or not.. thing of it is, if i told someone i wanted 2000 for it they might offer me 1500, same guy might offer 2000 if i tell him i want 2500... you can always lower your price, but only a fool will try to raise it...
also.. about this "knowledge" thing.. how many times do you see a few of the same items from different sellers listed on the first couple pages of the fs section? more often than not i'd say... if you're not sure if it's a good deal or not, flip through a few pages, chances are there's some of that same item that have been sold, note the price on sold items, if there's 4 of the same item sold for the same price, it can't be too bad of deal.. impulse buys screw you every time... if you want the part but don't like the sellers price PM the seller your offer, if it doesn't sell he might decide to settle... just my 2 cents on the subject..