Do iPhone cases mess up your lock/home buttons?

I got a case from ebay for $5.99 for my iphone 5 and I love it. It's great and not overly bulky, but it has a button that covers the lock button on it. Well the button that covers it fits very smug to it to the point to where you definitely don't have to mash it hard to get it to unlock or light up.
I'm used to an otterbox where you actually have to press the button to make it light up because it doesn't fit as smug to the button.

My store manager told me that he didn't feel that it was anything to worry about because if it was tripping the button, it would be lighting up without me touching it, but I'm still a little worried about it.

The case is the rugged rubber matte case. It doesn't have any reviews to it either which worries me as well.
Just looking for opinions and thoughts.

No most iphone cases aren't meant to mess up your lock/home buttons. That's what you get for cheaping out, a cheaply made case.