[...]
Playing slot game doesn't need to chase the win because that will be back to how good our luck. We should try to enjoy the time we have and not thinks about the losses. We can win someday so we don't have to chase the wins or recover our losses.
Especially with games that are purely based on luck (i.e. slots, Plinko, ...) you must not fall into the “I have to chase my luck” trap, otherwise you will lose your money faster than you would like. Especially if you're stuck in a losing streak, there's often no point in playing any more games - it's much better to simply switch off the PC, take a deep breath and continue playing another day.
From my own experience, I can say that playing games in such a situation is really no fun. But that's exactly what these games should be for - very few people get rich with them anyway.
Apart from that, I completely agree with you: you have to invest a lot of money to reach VIP level quickly.