ya if  you are just buyingone coin. and not investing the full 120. ok say you buy a coin now like you say and it goes to 1000 ya you make 880. but if you have 120 and want to invest all of it and it happens to be 100. well then you get 1.2 bitcoins.  and this goes to 1000 you THEN get 1200. its not twenty dollars its two hundred dollars! and this is for one BTC imagine you have eight hundred and sixty bitcoins. - I hate how people dont get this.


You have to look at it from the stance "I have a set amount of fiat I want into bitcoins." not "I am going to buy one bitcoin and pay the extra 20 bucks to make it a full bitcoin."