The winning odds are really low but if you do win you can become rich over night, the winning sums are high because people don't really have a chance to win it. But once in a while a gambler gets lucky and hit the jackpot.
There are ways to increase the chance of winning like gambling on a group of number or gambling on a color, the option with the lowest odds is to choose a single number.
As always with any casino game, the house has an edge. In roulette, that edge is 5.26% or so, with slightly worse odds if one were to play a 5 number bet. At online casinos your odds are improved slightly by the fact that you are given cash bonuses while playing.
Somehow roulette became some kind of a symbol in casinos, many movies show the roulette game when they related to a casino and the game is also very popular in online casinos. In the online casinos the odds are higher and you can play roulette and enjoy it and even to have a chance to win sums of money.
Most of the winner at the roulette game said they chose their lucky number and won the big prize. Maybe in luck games such as roulette it's good to rely on your instinct and on the numbers that goes with you all your life. Who knows, maybe your lucky number will some day bring you the big money and the glory you always wanted.