Be careful, when the other players ask you to wait
If a player asks that you wait two more hands, because they are winning. It might be best that you do so, otherwise you might get unwanted attention from the pit.
Wonging in once on me can happen. But, If the same player wongs in on me in high counts more than once in the same session and my second request to wait goes unhonored, I make it sure everyone in the area knows how unhappy I am about you jumping in only when I start winning. If you are particular rude to me, I will even stop the game and call the pit manager over.
After all I'm trying to make money also and being rude to other AP's is of no excuse.
However, if the count is negative, jump on in. I welcome the opportunity to quit playing, acting as if I pissed that you jumped in.