Kinda depends on the situations.
If they are ganking and pass a Pink, but the enemy is already a bit too pushed to actually react properly, then they just skip it, gank and get some kills, they may forget about the ward they had JUST passed but after that they just score through the game that way.
It all just depends on risk/rewards. Not every ward you kill is worth the time it takes to kill it. There have been MANY times that I have been randomly jumped by the enemy and bot lane when taking out a pink ward in the river..
Plus in an ELO THAT high and small, they're just battling the same people in a sense almost all of the time. So it's just kinda the same thing over and over.
Losing doesn't matter half as much as you think it would to them as long as they hold their spot in the ranks.