Ethereum's price has encountered huge volatility recently too, and overall gambling with cryptocurrencies has double risks/rewards, because the price of a coin might rise or fall after a player deposited it, and shift the total value change of a gambling session to either side. But Bitcoin is a bit less volatile that altcoins, so it's safer to use it for gambling. As for fees, it can be solved by depositing larger amounts once per month, for example, although it requires more self-control to not spend it all too quickly.