No one plays AP utility sups because they really only have 3 item slots to buy AP utility items
Sightstone and Coin are practically must grabs for AP utility supports, getting no AP off these items to help them do THEIR JOB Frost Queens sucks ass that it's common knowledge that you swap it out for coin later on, not unlike Frost Queens gives a pathetic amount of AP anyway...
An what kind of AP can you get with those 3 slots? ...fuck all if you actually build AP utility items
AP utility supports are just a mess right now, with Riot putting little attention into that fact it really sucks
Not only one person's job to keep the map clear of wards either.