OK, I'm not straight-out accusing you of buying the account.  Stuff like that just raises red flags in my head when I see them, because I've seen stuff like that so many times with purchased accounts.

You might have plagiarized something only once, but that's all it takes on this forum.  That said, I'm not a moderator, nor has one posted here yet.  Just my opinion, if you only did it once and it was a long time ago--and you realize what you did wrong--I'd vote to give you a second chance (though it doesn't seem like you're contributing much to the forum except short, low-value posts).  But only the mods or Theymos can tell you what your chances are.  Good luck.