Why did I jailbreak my iPhone?

Why did I jailbreak my iPhone, even with iPhoneOS3?
 
1.) It is MY iPhone, so I don´t want it to be crippled with unnecessary restrictions.
 
2.) I want to use it with my GSM SIM card, which happens to be from a provider, that does not sell the iPhone, yet.
 
3.) Great software, I won´t get from the Apple app store because of too many restrictions, like the wonderful offline Wikipedia Wiki2Touch in various languages with image support, iCallBR for deleting entries in my call history and last but not least biteSMS, which includes a character counter for SMS writing.