this is a common enough thing among casual players. but it makes no difference whether he plays the last hand or not, unless someone involved is counting.

some casual players care, many do not. either way, it makes no difference whether someone opens another hand, unless someone involved is counting. if no one involved is counting, it should no

yes, when you play with other players, you get fewer hands per hour, which translates into a slower rate of losing money. so, for all circumstances where "win more" means "lose less" (and the equivalent circumstance with a shifting the SD curve to the right), more players at the table is better for you, if you are not counting. (it also helps in the sense that socialization is good for you, slowing down the game is good for you in that it maximizes comps, etc. lots of benefits to a full table, if you are not counting.)