dont you think I am not a chronic spammer who should receive such treatment(directly permanent ban)?
With Temporary ban also I get a final warning that I should be careful enough to avoid such posting. If at all I get chance I will surely go back through my back dated post and delete everything which is of low quality.
The forum rules are actually very lenient and not as stringent as it maybe should be, considering the influx of spammers and bots. But the issue of pliagarism is a perculiar case, and there is no second chance, or reprieve, especially when the violation was made in a bid to get a reward. Theymos already discussed this issue;
...Plagiarism is what gets people permabanned, not just copying. Plagiarism is copying with the intent of passing the work off as your own. In essentially all cases, plagiarism deserves a permaban because it usually proves definitively that the person is here for the wrong reasons: to fill up space in order to get paid, not to actually discuss or contribute. If someone was able to convince us that they were plagiarizing just to eg. impress people rather than to fill up space, then a lesser ban of a few months might instead be warranted. But this has never happened AFAICR. (Arguments based on plausible deniability aren't going to work; we don't need to prove that you had the motive we see in your actions.)
If you treat posting as a job, a chore, then you must live in fear, since the forum is not made for you. In this case, you need to blend in as someone who actually cares, but plagiarism will immediately out you, and producing a mountain of useless posts will also eventually be noticed, if more slowly. If you do actually care, then this will be obvious in your posts (and probably your merit score), and you will have nothing to fear from moderators; even allegations of plagiarism will be doubted when seen in the context of your other posts...
There is no hope of getting your account back.
And new accounts created by you and posting outside this thread would be tagged for Ban evasion and banned as well.
You can still read and learn from the forum