I have tried to make the same valid point that points are 300 credits to $1, not 1000 to $1 because of the cost to buy them without discounts. This is the same conversion that listia gave me so you have $40 books listed at $34.
Just correcting you on your $9 price convertion quote. You would have to start them off at 2700 credits. I am sure that it would go up pretty high from there but a high start bid scares ppl away but a low one gets their competive blood boiling making them invest, in this case, more credits, at times in obseane amounts. Forgive the miss spelled words but I am a psychology major so trust me on this :)