Although Blackjack itself a gambling stuff and of course revokes many skills and covers several aspects. But, Betting within Blackjack, is really something very interesting. I'm sure you can understand that a person outside a game can either be skilled even more than the players or can be just a person very first time looking into Blackjack. He can bet without any experience but the risk is still higher however, in the other hands, if the person is Expert Blackjack Player, can make his side sure to win.
Here is a video stuff that talks about Blackjack Betting Progressions in a Casino.
By the way, the video is by Bill Garner which is my favorite figure in the field of Blackjack Progressions.