What is diffrent between open source cms and own coded cms

[extomas]

Hello,

let's talk about thing which is interested to me.

I can't understand why need to create another cms system if you can use plenty of them opensource for variuos projects?
I think that creat from scratch is harder than use something that is done already.
I understand that there is sometype projects which need develop something special.But I'm talking about standard projects, like portals, communities.

[chrisy.]

People like custom, makes them feel special. Plus if you owned google, arent you the only one who owns google's scripts? Wouldnt you feel special.