I heart the nfinity evo's that's what we use. I actually have two pairs. One for practice/games and another for wearing anywhere I go. They have held up amazingly well and there super comfortable!!
I wear the Nfinity Evolutions and they have held up very well. The way I treat my shoes could be considered abuse with how much wear and tear I have put them through. I'd be willing to post a picture of mine if you would like.
I don't think it really affects it. If you were really worried about it you could always set it to a static wallpaper and watch the battery life until it completely drains and then repeat it with the 30 sec wall change and see if there's any difference. I highly doubt it would be anything...
I've linked to the article not to violate any copyrights. What does everyone think about it? I've included the picture of the uniform in question.
http://www.mercurynews.com/breaking-news/ci_18879433
I found it I think. It's called the National Federation of High Schools. Section 2 Sub 6 states "When standing at attention, apparel must cover the midriff."