My experience is very much different. From my own experience in the executive work place, your work history, credentials, publications, deals, and/or achievements will speak much more highly of you than how you treat a cell phone. Cracked iPhone screens are so common these days that most people don't give it a second glance - unless say, you're using that iPhone as a portable monitor to show documents/pictures to a client. (But then you usually have an iPad, and it most definitely should not be cracked.)
Most people will likely assume that you just have better things to do than to be standing at the Apple Store- like working, going to your son's baseball game, or just spending time with your family. Or maybe you just don't care because, it's just a phone, and there are plenty of more important things to worry about.
It's not like you polish your golf clubs before taking a client out...?