I assume the money going into their pocket, 10/10 thieves (winners) recommend theft (winning)

That's totally hyperbole. Perhaps they find themselves luckier than average - like most :) People overestimate this fairly easily/often.

It's vague... Counter point: opportunity cost. Nobody can say what will/won't happen, why even try to guess at this.

Most endeavors don't go as poorly as gambling. In my experience at least

If they talk about in-game currency, probably they mean mudflation. It's like inflation, but in games. If you can produce in-game currency out of nothing, the value drops.

Oh - I see. In-game currency is taken out of circulation.

Yes, this was what I was trying to describe.