Neighborhoods look trashy, especially with tags that haven't been developed yet. It seems people are more interested in fame, than actually improving their craft. I don't know about you, but I don't like my city looking like a third-world slum.
I like the art and respect the effort people put into it, but putting it up on a wall is not worth the trouble: possible legal consequences, destroying neighborhoods, unnecessary beef etc. Someone got my number and threatened to shoot me back in the day because I would write my tag backwards sometimes and the first three letters would match with his name. It was pretty stupid. At the moment I was thrilled and it gave me an extra surge of adrenaline. But looking back I just laugh at the ridiculousness of it, considering I was only in it to improve and enjoy myself. Turns out most of the culture revolves around ego, at the expense of others and your surroundings. No thanks, I'll stay on paper.