Just to revisit this for clarity, I bought EOS at 0.000491 when BTC was at 3570.
Right now I could sell my EOS at market at 0.000400 while BTC is at 4100 and I would almost break even. Though even when zoomed out to a full month on an hour chart the difference from .000400 to .000499 looks huge.
It's tripping me out a bit. On the chart it won't look like it came back to base, and I'll have less BTC if I trade it back now, but in relation to USD it'a about the same.
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 :-)