Sometimes that is a good way to make some profit for your future but for me even i did that method sometimes i do always check first which of those two i can get much more profit or which of those have an a cheaper transaction because sometimes in our own countries there are times that sometimes that ethereum transaction is much cheaper rather than bitcoin and sometimes bitcoin is also cheaper in other terms but in the end you can find the answer on your own mind and hands how you will manage to make a lot of profit and would not waste some of it for nothing.