I agree, It seems that it will be difficult to make an actual profit in USD or EUR.
When BTC is going UP, EOS will go down and visa versa.
At the end you would like to exchange it to USD(t) or EUR but you can make fantastic trades in EOS/BTC but your result in USD could be the same as you bought it. I probably don't express myself clearly but I understand your question :-)
Now, it's time to create a strategy :-)