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Understood. But that's all speculation. No one knows what investors of ETH would do. And looking at the historical stats on yolodice its far more lucrative to keep ETH on there (once investing would be open) than it would be to get the staking rewards. Obviously there is more risk to being an investor vs. staking.
Also, we don't know what Ethan could be up to in regards to the staking. I think it would be cool if he implemented staking to the website on top of the ETH investing. Would make a lot of sense and attract a lot of people.
Let me make it as layman terms as I could think of and explain it. We have coins BTC, LTC, DOGE right? Let's take these three into account.
We also have ETH which is what we are talking about and we are going to look for differences. The topic is investment, and why investment could change max bet and how it could affect the gambling. Now on BTC, LTC, DOGE we do not have any new 2.0 type of improvement that will change the coin at all, it will be all the same without any changes, just same old same old thing.
On ethereum we have 2.0, we have proof of work becoming proof of stake, which means more reasons to hold it and not give it to a casino. Now when you have ETH investment and there is 10k eth invested and you get to bet 100 eth, suddenly that could be 100 eth invested and 1 eth gambling, don't you see how that would be bad for the casino?
Firstly, I think you're worrying a bit too much about a hypothetical situation that would likely never happen. It seems REALLY unlikely that 90%+ of the ETH bankroll would be withdrawn, most investors are investors for the long haul, and even then the bankroll isn't public yet anyway. Even if people did and the bankroll was public, that's just the nature of the beast of a dynamic bankroll; it changes. People know that.
I don't see at all how it would be "bad for the casino". There's four different coins, people could just play in a different currency (as you said "let's take these three into account", except you ignored them completely). There's not much point in creating some unrealistic apocalypse scenario where the bankroll drops by 99% just to support your claim - as Rawdog said, this is all speculation anyway.
Just 2 weeks ago the LTC Max Bet went from ~20 coins to ~90 coins because some investor invested ~7,000 LTC, then they withdrew it and the Max Bet dropped back down (a few days later it seemed they invested again), but during that time that the bankroll dropped by ~78%, I didn't hear a peep from anyone - no complaints. People just played as they normally would, or played in different coins.