Thanks hazek and Rosenfeld that helped me alot. Further oppinions are welcome.

Nice forum by the way 

-n00k!e

So I'm new. Hello everyone.
I'm really interested in the idea of bitcoins and i have some questions:

Lets say I want to use it as a sort of investment. I buy some bitcoins, wait a couple of days and resell them for a better price i bought them, because exchange course is constantly rising. Correct me if I'm wrong here.

Thats my idea how to use bitcoins. I understand it as some sort of stock exchange activity - just without stocks. When I look at the exchange rates, which are constantly rising, it is quite profitable. If I had done the upper procedure one month ago (with euro because im german) i could have gained about 60% profit.

It all sounds too easy.
a) What's the catch?
b) What is affecting the exchange rates?
c) Am I misunderstanding something essential?

I have a couple more questions, but thats enough for now.
Please no discussions whether my plans are greedy / good / honorable or not.

Thanks

-n00k!e