Feeling lucky? :: ::
I never offer advice to other players without being asked. When asked and pressed for an answer, I ask them if they are feeling lucky, or do they think a bust card is coming next. If they specifically say what would you do on this exact play, hit or stand, I say it all depends on whether I'm feeling lucky.
I would never tell another player a correct play, or to "get a book". This phrase often crosses my mind, especially if the person is nice and if they have somewhat of an idea what they are doing. But the phrase never crosses my lips.
The reason for all this? Cover.
The reason for not getting aggravated? As the other posters above stated quite well, there is little to gain. I have offered to teach people I know and trust the rudiments of blackjack. Some want to learn. To them, outside a casino, I will say, "Get a book". But many others say, hey I don't want to be bothered by all kinds of rules and things I have to memorize. I am going to the casino to have fun and escape all the rules I have to follow in everyday life. I'm going to gamble. I know I'm probably going to lose money, but actually I won a couple hundred on July 10th, and my spouse just hit a big one on the slots, and really I just want to see how my luck is running.
An interesting phenomenon is that this attitude seems more prevalent among high level executive types.
Few people want advice, even if they ask for it.