I sent some ETH yesterday from a coin exchange to my ETH wallet. The gas limit was 21000, gas used was 21000 and the gas price was 111.608. The fee charged was approx. 0.00234 ETH, which was approx. 8% of the ETH transferred (I sent a very small amount). I am new to ETH and have done some basic reading about gas prices, etc., but it seems that I could have transferred one entire ETH coin for the same fee. Am I correct? If so, then one should always accumulate at least one ETH before transferring in order to minimize fees?