There are a ton of screen protectors, and you can often get them for free when you purchase a case. So why would you pay for one? Simple, for the same reason nobody pays me to play golf. I'm an amateur and if you want a good performance, get a professional. The same is true with screen protectors. The free ones are typically worth what you pay for them. Bubbles and fingerprints are almost inevitable, and they end up making the screen protector useless.