Personally, I don't get it either. I prefer more even matches, and the close matches are the more fun and memorable ones, even if they necessarily end in a win.
But I do know that there's sadly a lot of people who are all too happy to delude themselves into believing a win is a win, and that's all that matters to them. It doesn't matter to them who they play against and how they get it, it only matters that they win. And that includes people that outright cheat as well, some people are so obsessed with winning that they've deluded themselves into believing they're good players even when they're outright cheating with hacks.
I don't disagree. Though I will say that I most often see players give up when they're pit against premades because they feel so demoralized by stacked teams, so they're kind of one in the same issue.