Inc downvotes
Instead of trying to improve this item, just remove stupid sightstone from game.
let supps(and occasional jungler) actually have freedom to build...
just improve trinks so they are the go to ward source for all, do what you must to make it work like lower the level to upgrade it to 5 or something, maybe with an additional upgrade available at lvl 10 for extra/longer/faster wards. don't worry carries will still avoid it like the plague because they need damages super bad.
an entire role should not be based on buying sightstone and being the teams excuse to not buy wards or upgrade totems.
no more ward bots, let supports live...