Poker and Blackjack is the only games i know that requires skills, the rest is you need huge bankroll in order to yield some profit.
Not just huge bankroll but most with good management with your emotions, you need to control so you'll be able to win decent.
Because slots and dice are all based in chance and probability. You may encounter lose streak especially when you increment your based odds per bet.
Huge losing streak may triggered your aggressiveness. ending point lose big amount of money.
Sports betting can be also considered especially when it requires knowledge and research.
Sports betting is more on skills, your knowledge is your advantage to this types of gambling.