but it will be better if there is a warning letter 1 - 2 and 3 = banned for warning if a BTT member violates the rules
Your post shows exactly why a warning letter would not work. You show 1-2 warnings before receiving the Ban. So you already know no one is going to listen to the warning letter the first time.
Where as now I bet after 1 year, you definitely won't break that rule again. I'm pretty sure anyone else who sees this also won't as there is a large group of people only here to wear a SIG for their "paycheck".