Another possibility is that the 'plagiarism' post from those high-ranked users are hard to be found (maybe he did that when he's still newbie). But yeah, it's definitely a waste of time when you finally ranked up but then you got banned because plagiarism when you're still Jr. Member.
This is why I wrote
'intentionally or un-intentionally'.Sometimes, we did stupid things un-intentionally when we were noobs due to not know forum rules.
Sometimes, we did stupid things but naively thought that we were smart in noobihood or even in higher ranks.