@upNdown If no one tipped the dealers, and, the host of a "friendly" game decided he just couldn't afford to keep the dealer, and consequently the game became a self dealt game, would you still be as eager to play at that game knowing everyone had to pass the deal. If you can unequivocally say you'd have no problem doing the self deal, then by all means don't tip. If you like having good dealers isn't it worth a few bucks from the winners to help the host pay for the dealers?
Personally I HATE self dealt games. I'm happy with helping to pay for a good dealer. Of the friendly games I frequently attend, the amount that is consumed by the host for expenses, coupled with what I tip is still less than at a casino, and, I enjoy the game more, 99 times out of a hundred.