I know its a viable strat but in this case it was not their intention to feed and they didn't play it at all like you describe. How we won is the enemy team started getting cocky and we started catching them out, then we started winning team fights, practically every late game team fight we won. Nobody was doing a split push strat. Also, because I was jungle Nunu, we got Baron early then a 2nd Baron later on. The enemy got 0 Baron. We also got several dragons, I believe more than the enemy. So because I was Nunu we were able to secure objectives.
Teemo went 7-14-18
TF went 11-16-14
They were getting kills which was resetting their gold. TF died like 3x in a row then got a kill, then died 3x more.. starting 1-6. He was always worth a significant portion of gold.
During teamfights, Teemo & TF would die, revive, & TP and keep fighting. So as the game got to late game the enemy had to kill 7 players instead of just 5. We could have lost easily but the enemy threw it very hard by getting cocky. If they just grouped as 5 earlier we probably wouldn't have been able to do much.
Also to note: The teemo+TF duo didn't communicate in champ select and we ended up with no support cause we had a Kha Zix that was supposed to mid, then TF picked as last pick. Our bot lane got destroyed too. We only started winning after laning phase was over and we caught the enemy jungler being stupid a lot then the revive+tp strat started working for team fights.
Some people do give up easily, our ADC was basically saying he quit, until we started winning team fights. I rarely ever give up.
The 18 kills was worth much more than 40-50 CS, but because of Baron 2x, that helped us close the gap by lot (10 kills worth). Also more dragons and more turrets. Based on numbers from lolking, I can guess we were up ~4k-7k gold by the time the game ended. 3k being from barons, 2k being from Nexus Turrets that probably never helped us anyway since we killed them right before winning the game.
We had--
Nunu: 11.8K (Jungle)
Teemo: 15.5 K (Top)
TF: 15.1K (Mid)
Ezreal: 14.9K (ADC)
Kha Zix: ? (Support)
-----
57.3K + Unknown Support gold
Enemy Team:
Volibear: 11.9K (Jungle)
Cho Gath: 11.9K (Mid)
Fiddlestick: 11.2K (Support)
Draven: 15.8K (ADC)
Zed: 13.6K (Top)
----
64.4K