User blog comment:Willbachbakal/(Item Concept) Another Look at Vision/@comment-5593561-20140722092926/@comment-1330314-20140722113159

While it is true that supports alone wouldn't have the same warding power (though it would be cheaper to them), every other role would have equal access to that same power, which should've been the case right from the start. It's fine if the marksman can't get Sightstone, especially since Sightstone in the laning phase makes for boring, super-safe lanes, and if it turns out that the support cannot singlehandedly provide enough vision for the team (which never should've been the case), then that should be all the more of an incentive for others to contribute more to vision. For the 1000 gold you'd usually need to build Ruby Sightstone, you'd be able to buy a Giant's Belt for a comparable amount of health, which you'd also be able to build into a stronger item.

The issue of Sightstone forcing you to buy more wards is, in my opinion, moot. Three wards is already the limit of how many of them you can carry around (and I think Sightstone's charges should count as wards, thereby singlehandedly filling the ward cap), and this limit should be universal.