Friend of mine used to be a casino worker. Roulette is not 'rigged' but the operator is trained to land the ball wherever he wants. Good operators will be able to land the ball with a 2-3 spot miss from their target spot. Based on that, it's pretty easy for specific number bets to be dodged. This is why you'd want to sit on a table that is populated.
there is golden rule for gambling we always play with that amount that we can afford to lose while we are blaming others for our lose, that is common thing in roulette some dealers knows where to land the ball for expected outcome result and that kind of things happened almost most the online casinos.