The thing is that it can actually be rigged in some places. You need to be careful where you choose to play. If the casino is honest, then your emotions are only rigging you. 
Legal casinos or online betting may have less manipulation, although this is only an assumption. However, most of it is not because of dishonest providers, but rather we are wrong in deciding to gamble because of our mistakes in making decisions when we lose. So, it is not the service that is to blame, but we must introspect ourselves because following our emotions when gambling. An the funny things is, after everything is gone, started to blame the casino
