Yeah, this is why I know I dont belong in bronze, but its why I have a hard time getting out.
I cant get my team to go objectives half the time, even if standing behind me and trying to kill steal me would be smart while I push turrets, my team wont do it.
Here is an example match, its not ranked... but its a clear example of a team refusing to close the match out.
http://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2126939216/225715083?tab=overview
Its like you said, we would get a kill on 3 of them... then instaed of helping me drive a lane... they would farm the jg, get a big group of minions, back and buy stuff. Just whatever to waste time and drag the match on long enough to throw it. Eventually 2 people started Baron, and 3rd joined in while they were all up, and against better judgment I stood guard, I didnt want to be in the baron pit when they attacked. They managed to wipe us out cause they jumped our ADC/Mid while I was trying to lock down Yi and Jax.
People backing CONSTANTLY to spend their gold to get a new toy are the biggest problem, just wasting time letting the enemy farm and get chances to catch back up. You have to start deciding if you want to finish off your
or you want to win, cause backing each time you have the gold for a component of it when its your 4th item is actually hurting your pressure, and making you more likely to lose.