Is it ethically wrong to purchase something knowing you are going to return it?

[roadkillers]

For an example, I am going to buy a high end graphics card to play a game. Yet, sometime soon Nividia is going to release their new graphics cards which means prices are going to drop. So I plan on purchasing a card now, then returning it because the price will be lower.

 

Another example is purchasing an air conditioner then returning it once summer is done.