trading and making a profit is like a cycle, you invest some initial amount and if it is small then you grow it little by little and keep all the profit inside the process and continue trading with all of it until you reach a level that you feel like you are taking a bigger risk, so in case i earn 100BTC profit i will reach that lever and withdraw the extra amount.
es, and it will not stay as bitcoin forever right
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
of course afetr a certain amount or our goa is reach, we should withdraw it and spend for that goal or target to spend whether its for vacation, house repair,education etc. Sometimes it can be an emergency fund.Bitcoin is another form of investment or another avenue in internet where we can earn,spend etc.