Im doing that since btc fees went skyhigh. As said eth is performing much better than btc so to compare your gains you need to compare with putting entire bag on ethereum. Also I never move money from exchange in btc always in eth or other alt (again due to fees) so why should i measure in btc again? Lets say btc recovers... do we really think its gains are more than ethereum in long term? Prolly not so you should compare investing in alts vs eth not btc.