User blog comment:Emptylord/Season 3 - PBE Patch Notes/@comment-112.198.90.34-20121125120139/@comment-3974211-20121125120927

It costs 9 wards to buy the item that gives you 4 free wards (2 at a time). In all fairness, unless they're also buying an excessive number of wards in tandem, you won't notice a change. The Sightstone is literally just to ease the gold burden on supports without actually impacting on other aspects of warding.

Oracles only lasts for 5 minutes now for the same reason. If you couldn't kill the person with Oracles (due to them being a tanky support, or you're just being zoned) - you lose sight for the game. Now the enemy has to keep paying if they want to keep you zoned...