Thicker case = More protection, but less appeal
Thinner case = Less protection, but more appeal
Skin = some protection, good appeal
Naked = no protection, excellent appeal
People will what they value more on the scale, protection vs appeal. I am not too clumsy. My previous iPhone hasn't been dropped yet. So i'll likely stick to a skin/film.
However, this video is nice to show that if you do accidentally drop your iPhone with a skin on, it could survive, little bit more assuring, but no guarantees.
Actually, Wrapsol makes devices sparkle so greater appeal.