I'm going with the it's parasitic and slightly immoral.
In some cases anyway. There are few cases where i'd see it as not bad, though those are rare.
For example. The Toys R US in times square always has an a lot of Wii's, or atleast did in the summer while people I knew couldn't find it elsewhere. Buying Wii's from that store and selling them at a profit is basically more of a "trading" act. These Wii's arn't getting sold right now anyway... and even if they did they'll be kept in high demand because it's a flagship store.
However if the Wii's in the store are going to sell out within the week... buying one then reselling it is basically taking it away from one person who intended to purchase it for personal use, then selling it to a different person for personal use at an inflated price.
The parasitic and immoral problem can be explained as if you treat the consumer as the same person. You are basically buying something, which you have no intention of using, right before someone else, just so you can sell it to that person at an inflated price.
How is that not parasitic or immoral?
