playing on summoner rift map

It's just an idea but since its only 800 gold i feel if everyone on the team holds on to a Sight-stone tell its the last item in their inventory that they can then sell for their last damage or armor item it would give them and the team need vision on the map to 1.protect them self's, 2. let them catch enemy s separated from their team. 3. let them go for objectives safely. cause face it everyone's always screen about being caught out from lack of vision they have yet refuse to really do anything about that them self's when they can just blame the support who's already warding with their 1 pink ward and 3 sight-stone wards, but everyone on the team had a sight-stone that's 15 normal's wards along with 5 pink wards that could be on the map at 1 time. I mean just think about how much vision that would grant your team. (Think About It)