alt Hacker NewsHere's a paper rejected for plagiarism. Why don't you click on the authors' names and look at their Google scholar pages... you can also look at their DBLP page and see who they publish with.
Also look how frequently they publish. Do you really think it's reasonable to produce a paper every week or two? Even if you have a team of grad students? I'll put it this way, I had a paper have difficulty getting through reviewer for "not enough experiments" when several of my experiments took weeks wall time to run and one took a month (could not run that a second time lol)
We don't do a great job at ousting frauds in science. It's actually difficult to do because science requires a lot of trust. We could alleviate some of these issues if we'd allow publication or some reward mechanism for replication, but the whole system is structured to reward "new" ideas. Utility isn't even that much of a factor in some areas. It's incredibly messy.
Most researchers are good actors. We all make mistakes and that's why it's hard to detect fraud. But there's also usually high reward for doing so. Though most of that reward is actually getting a stable job and the funding to do your research. Which is why you can see how it might be easy to slip into cheating a little here and there. There's ways to solve that that don't include punishing anyone...