Well, you can always do as you please to note how much profit your getting. If you want to account for your business and how much you get, then by all means. However, if you would have to put that accounting to another person and pay him to do it for you. I am not sure if that will be worth it because the amount of what you can get with your ventures, especially when you are starting may not be that much, and also, it would be better if you do it yourself because, at least, it's free and you get to learn first hand how much you earn and the adjustments you need to make for it to be bigger, in cases if it is not within your profit goal.