When I was younger I didn&#x27;t use Yahoo! because I disliked their logo and the use of ! in their name.<p>Petty? Yes. Did it effect their market share? By at least 1 - yes.<p>I highly doubt I was the only one to act like that. Design matters. Even if you don&#x27;t think it does.<p>E:<p>For those wondering, I also didn&#x27;t enjoy listening to Panic! At the Disco. They also eventually dropped the !.