At Betcoin 1 btc = 1,000 credits / mbtc, therefore if you deposit 1.48 btc you get 1,480 credits / mbtc and if you deposit 0.327 btc you get 327 credits / mbtc. There is no conversion to any fiat currency at anytime. Therefore when you win 2,433 credits / mbtc and you withdraw you get 2.433 btc or if you win 348 credits / mbtc and withdraw you receive 0.348 btc. The only questions we ever get about this are typically on the withdraw.
The default currency at Betcoin is bitcoin, therefore when you deposit your ethereum and litecoin it is converted into mbtc in real time and your account is credited with the mbtc value of your ethereum or litecoin.