It's easy.
Just casually mention, during a lull in battle, as if you're just making small talk and not trying to tell them what to do:
"Hey I just learned today that it's impossible to get an S+ rating without upgrading your trinket! Haha fucking rito."
It doesn't matter if it's true or not.
Carrot OP.
Miror B2 votesSee, I go with the whole "vampire philosophy" (in that I won't go anywhere that we don't have direct vision, even if doing so is 100% safe and doesn't pose any risk). Then my team will usually upgrade their trinkets and ward like crazy, just to get me to join things like baron attempts and teamfights.
CrankyChipmonk1 votesBut...
Carrot vs. Stick
In case you don't understand that, its a question of how to get a horse to move in the direction you want it to. You can either beat them with a stick that is to say punish them (aka refuse to go places that are 100% safe to the detriment of your team) Which results in short term benefits but long term anger or resentment (or an increase in toxic mentality, feeding etc.) or you can hang a carrot in front of the horse causing them to walk toward the carrot of their own free will.
They will do what you are trying to achieve either way, but using the carrot fosters good will and a belief that listening to your directions in the future may result in future carrots. The stick simply fosters resentment, frustration, and a need to take that frustration out somewhere. (in their next game perhaps.)
If everyone uses sticks, everyone suffers down the road.
Too old for this2 votesMate...mate...I think you just gave me an answer to the question I've been asking myself since they introduced trinket upgrade! I will definitely try this strategy in my next game!
Only downside would be if some smart ass replies by saying how he never upgrades his trinket and always has S+ rating :)
CrankyChipmonk1 votesWell yeah but whatever
Glad you like the idea though. I've had good success with is so far. (Or strong effects from confirmation bias)