As soon as OP said he only submitted bounty reports and never made any posts, that's immediately what jumped to my mind.  The only two things that will earn you a permaban in practice are plagiarism and ban evasion.  Technically you can get banned for spamming, but you would have to be a "true" spammer who spammed advertising links or the like--and those members usually don't protest their bans anyway.

And may that road keep you for a long time to come.