IMO using altcoin (such as Doge) is more practical. There are times when Bitcoin mempool is full which makes transaction fee very expensive.
Possibly. But then how will the server get its balance in the altcoin? Unless you're suggesting we hold a hot wallet stocked with the altcoin of choice... which is risky if the altcoin dips. What's the transaction fee like for ETH? That's one of the most stable altcoins I know. Will check it out.
That's the difficult part. Altcoin usually have lower transaction fee, but tend to be less stable. It's basically trade-off.
P.S. ETH itself have become very popular and also experience high transaction fee.
What i mean is player who join out of financial motivation is likely to be less friendly and use deceptive tactic to earn money.
No doubt about it. I'm sure we can find a way to moderate in-game transactions, however, to prevent or dissuade/discourage scams in-game. What kinds of deceptive tactics are you thinking of?
It depends on the game and i don't know much about Minecraft. But few common deceptive tactics i know are,
1. Unfair exchange rate during trading. Usually people who don't know average exchange rate become victim.
2. Falsify detail of the item to make it looks more expensive. One example i remember is CSGO skins where each skin quality have different market price.
3. Modify game client to reveal more information than you're supposed to know. For example, location of Diamond ore.