The main reason is easy: Bitcoin is OPEN SOURCE!
This basicly means that anyone can copy, edit or do anything with it. A big error. Or not?
Making it open source you allow to fix some bugs and adding new features (like KGW) or changing it's algorithm from SHA256 to Scrypt or SHA3 (for example).
Another good thing about making it open source is that you give all the reason why you should use that currency: there are no hidden codes or cheats from Bitcoin's authors.
The bad thing of this: there are a lot of stupid coins. Many jokes and just copy-paste Litecoin clons. Some of them looks promising but most of them are useless.
What do you think?
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