Banned members make the clan look bad. If they had followed the rules and checked the stickies, they wouldn't have been banned in the first place.
In your case, you will not be penalized because (1) it's a small ban, and (2) I believe it was an honest mistake.
People like rannane, who scam and account share, could face being kicked from the clan, penalized severely in terms of rank and respect, even being blacklisted from the clan. Does it make more sense now?