You are assuming ilvl = skill and experience. Maybe that worked the first few months after 5.4, but as the game stands now there are so many facerollers that have gotten carried even through normal, and so many alts around from experienced players, that item level is not a good indicator of playing skill.
Rather, I believe the high ilvl requirement sometimes is used by less skilled players as a coping strategy involving overgearing and trivializing mechanics.