So I get the last word? 


Unfortunately, those are my strong points.  You should see how much I suck at the other stuff!

I'm pretty good at math.  You seem to be confusing the odds of 20 reds in a row (1 in 1813779) with the odds of losing 20 bets on red in a row (1 in 615124).  You don't need 20 reds in a row to lose 20 bets on black in a row, because you lose on zero too.  It's surprising that the zero makes such a difference, but it does:


You realise of course that the sequence 1, 1, 21, 21, 9, 9 is exactly as likely as every other sequence of 6 numbers, right?  And that I was being facetious?  Maybe not.  I wouldn't really suggest banning certainly 'bad patterns' from your casino.  That could be considered cheating, and people might make bad threads about you.