7th item slot after purchasing Sightstone

This way: -only supports would get it since only they build Sightstone -real supports will have room for Pink in late game -full AP Sona and Annie "supp" will (maybe) buy vision since they don't feel like they waste item slot with Sightstone

The 7th slot is available only when you have Sightstone, when you sell it, the 7th item takes it's place and you are full again.

By real support I mean players that don't do full dmg, farming and taking kills, but the ones that help team by vision and utility.