How do Casinos make $$ is is with the Mob taking it at gun point?

No you be giving to them willingly.
The one armed Bandits will not need guns to take every Dine you might walk in with

Under Arrest?
They make money from the odds of you wining a game of chance and you not knowing the odds, for if you did would you come in?
From http://www.newsnet5.com/dpp/money/consumer/dont_waste_your_money/before-you-go-gambling-the-best-and-worst-casino-game-odds
Bean said your next stop should be the Roulette wheel. It’s simple, and pays fairly well.
“So you bet on your favorite numbers,” Bean said. “The dealer spins, and if your number comes in you win.”
If you stick to betting on just Reds or Blacks, you have nearly a 50-50 chance of walking away a winner. If it lands on red when you choose red, you will double your bet, Bean explained.
While it may seem you have an even chance of winning by simply choosing a color, there is one catch that gives the house its edge: the extra green 0 and 00 position on the wheel. It’s on all American roulette wheels.
Or, if you feel lucky, play just one number. It’s hard to win, but if you do it pays out 36 to 1.
That’s just Roulette The story above talks about most of the table games to make a long story short
“Play it long enough and you will lose. In the long term the house doesn’t lose,” Magazine said.
from the story above.
“Ever notice how the lighting in a casino is low and mellow? This is to give it a homey, friendly feel, kind of like sitting on your couch in your living room at home – and who wants to get off of their comfortable couch? Harsh lighting can be grating to the eyes, but a more subdued motif allows gamblers to settle in, kick back, and enjoy themselves while feeling safe, secure, and cozy.
Also, the carpeting in casinos isn’t just picked out randomly. Many may say that the patterns and designs on these carpets are downright tacky, with colorful swirls, lines, and splashes being the norm. However, to the human brain they are mesmerizing, welcoming and pleasing to the eye. In addition, the color of the walls is often times red which studies say evokes a safe, comfortable feeling.
And like shopping malls and stores, the soundtracks played at casinos are always soft, easing, and mollifying which helps get the gambler in the trance-like state that is desired.
Related to this category is the cleanliness of casinos. Any reputable one will be spotless with no clutter or waste in sight. Workers continually sweep and pick up after players which makes them feel somewhat pampered and catered to, as well as gives them a pleasing environment in which they want to stay.”
They are not here to be nice they are here to make money. IMHO every Dime that the Casino spends here will come out of the pockets of the fools who walk in thinking they will win.
Sorry