Earned Gold by killing enemy Champion

So guys, can someone explain me WHY THE %%%%ING HELL you get so much gold out of killing enemy champs in 2v1? I mean the Killed is granted a full kill gold reward and the assist is givin some gold too. Where is the damn logic?? Why is this so much profitable? I mean there isnt any strategic thought about for example sitting botlane as 5 people and also,its too damn profitable. Why isnt the gold for the kill splitted among everyone and the killer is given the most gold [for example 300 gold, killer earns 60% (180 gold) and killer earns 40%(120 gold)] That would be fair and there is a need for a more strategic gameplay.
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