so have you realised that senna gets 3 gold per mist? this means that with 100 mist she has 100 more ad, 75% crit, 725 range and on top of that gets a kill worth of gold. this champ already has insane scaling but giving her that extra gold makes no sense and it should not be in the game.
Do you know how long it takes to gather those 100 souls? It's not a walk in the park, dude.
(You forgot lifesteal on her scaling, btw)
Pyke as a form of making gold... makes sense the new aggressive support follow this trend.
PS: NOT agreeing with it.
carry supports need a way to scale. Would you rather her have a half hp execute after 1 item that generates kill gold for your team? No, no you don't 
