Hey all, if this is already the case, i apologize. But, to my knowledge its not. When i build a level one turret, i no longer receive money for it once someone upgrades it to level 2? It becomes theirs? Same for level 3. Well what i suggest is, once you build a turret at level one, you get 100% of its income, when someone upgrades it to level 2, you each receive 50% of its income. When someone else upgrades it to level 3, they receive 50%, the level 2 up-grader receives 30%, and the level 1 up-grader receives 20% If the level 2 up-grader is also the level 3 up-grader, they receive 75%. If the level 1 up-grader upgrades it to level 3, they receive 60% If that makes sense?.
I can't say i'm 100% sure about this but i think it does. If say you upgrade a turret to level 3 and a support hacks it, they get the kills and you only get the assists even though you spent all the money. Its happened many times with me and my friend (I'm Assassin, build turrets, he's support hacking them).