The slots players were never satified. They were excited to spend $100 and win $10. Or win many small wins and play it all away since it wasn't real money to them. It was staggering at times to see people in one evening spend $100K casually and could no problems. Others not so much but the majority just dabbled.
I gave up computer gaming before the loot box trend. But I could see its popularity. I went back to school and many 18 - 25 year old guys talked about it constantly. It was very obvious in its popularity.
With slots just like US military training is stimulus response reward. I've been caught up in simple games from their hold a past time a dopamine rush. It's that 3% of people who can't turn it off that get hit the worst.