We need to raise trinket awareness
Often I find that when I look at the match history I always have the second most wards placed (because the support usually has a sight stone) and I only buy a couple of vision wards and maybe (not too often I must admit) some stealth wards. People also seem to forget that they can upgrade their trinket and it is especially useful now with the new changes to the yellow trinket which means that you pretty much have a sight stone. I just played a 1:14 hour game where literally everyone was full build and what surprised me was the fact that there were 3 people who didn't even get the trinket upgrades despite the fact that they had so much gold just sitting around. While I must admit I wasn't vastly quick at getting the trinket I was still about 20 minutes ahead of everyone else.
http://matchhistory.oce.leagueoflegends.com/en/#match-details/OC1/78830091/200727054?tab=overview