So many Supports don't buy Sightstone, is there a reason?

Hey Guys, as the title is saying, I've seen so many Supports without a warding Item in the last weeks and just whondered why. Is there any reason I just missed or is it because of my poor Elo? (Silver V) Didnt play many Games. In my Elo, Junglers aren't buying the Tracker Jungle Item {{item:3711}} , what's totally fine for me, but when the Support isn't buying the Sightstone{{item:2049}} too, you dont have any Vision. In most games even the enemy Support isn't buying one. What happened? Am I the only one who got those guys on the Team? (No Whining, just want to hear if it's normal at the moment)
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