I've never use kraken yet, can you give us an idea how much is the fee for bitcoin and Ethereum withdrwal respectively?
less than 1 usd is okay, paying 10 usd and higher is really like stealing our money if we are not really gambling with some big amount, we want to save as much as we can so we can still have our desired bankroll after sending money to a certain gambling site.
This is my own method to avoid paying high fees, if someone feels this method suits his trading style better check this exchange or go for another alternative one. Just my 2 cents.