Why is Amazon charging $128 for a copy?

Whoa! They've dropped the price to only $90! Practically giving it away now.

I have been a long time eBay buyer and sometimes a seller, and a buyer on AMAZON.
What I have noticed over the years is that quite a few AMAZON sellers put a "Wildest Dreams" price on an item they list there, because unlike eBay, a listing can stay active for a long time, and doesn't seem to have a comparable fee(s) like an eBay relisting fee (as a minimum) every 30 days. There seems to be no real incentive to use a lower price, as AMAZON doesn't seem to have an aucton format.

TMI: (Too Much Information)
That also allows AMAZON sellers to run a "Dutch auction" where the seller lists their Blue Sky price, and periodically reduces the price until someone buys the item. eBay has recently added features allowing sellers to discount prices on their items, (it seems for only a fixed time period), but I am not sure if there is any seller's fee for that service.

AMAZON sellers can cause their own problems that way as well, by forgetting they have a listing, and not removing it if they sell their item some other way, and someone then "buys" the item they no longer have. Oops!
And AMAZON selling rules prohibit selling the same item on eBay, probably to help prevent that problem.


eBay has a slightly different pitfall for new sellers.
It seems easy to insert an item for sale as an auction with a low starting price, but if there is little or no demand for an item, it may not sell at all, or sell for that starting price to the ONLY bidder, and that seller has pretty much no recourse once a bid is placed, (unless they cancel the bid, and close the auction "due to a listing error", but if that is done too many times, the seller gets suspended - permanently, or for a designated time period). BTW, that starting bid is the price, regardless of what a buyer's maximum bid may have been - I won an eBay item for $0.99 once, but had entered a $10.00 maximum bid, and no one else bid against me; I did feel I had taken advantage of someone, but, short of simply sending funds to that seller, there was nothing I could do. As a starting eBay seller, I did "buy" my education about that matter, having sold a couple of items that way too, when I overestimated demand for several DVD titles.
I was reading the eBay Communuty Forum a couple days ago, and one topic on the board was titled "Help! All my comic books are selling for $0.99!!" While I didn't read it, it is easy to imagine that person listed a bunch of auction items with a starting $0.99 price.

AMAZON sellers' prices usually stay the same (or the seller changes the price up/down a few cents to generate attention), or high prices slowly go down. If you really, really want an item, like an out-of-print movie, you have to decide what you will spend, and hope no one else buys it for a higher price (Dutch auction).
Just FYI.