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towers dont win teamfights (you saw two fo the early ones next to top golem and bottom lizard, ie. no tower aggro), buffs DO. also by killing jungle you deny your opponents of gold exp while increasing the total gold exp of your team, the tower will die AT SOME POINT when it doe sthe gold exp will be nice, but you had factored it in anyway.
phreak made a good point about blue pilling in dual lanes which i believe is similar, he said he blows his spells then blue pills, because while he is blue pilling his team loses nothing as the other champ is gaining solo lane exp (provided they are smart enough not to die) too often dual will hang around on no hp and no mana simply to get that tiny bit of exp, when they die they grant a huge exp/gold advantage to the other team