I think with most things the amount you can earn depends on how much you put in. There's certainly money to be made but it's never easy. You could make a lot of money from this forum if you've got the time and are willing to work hard.
Where can you trade forex with bitcoin? How difficult is it to do?
Trading forex with btc I can make a lot per month, or at least a lot for me, which is roughly a low medium salary. It's not much but in my country life is pretty cheap so I'm ok with it and I'm sure that with more experience I'll do better and better 
Where can you trade forex with bitcoin? How difficult is it to do?
You can take your bitcoin amount to maximum if you have an art to do so. if you have an risk taking ability the i would prefer you to go for sports betting where you can whatever amount you wish to but ofcourse there is risk factor involved in it but if you want to earn bitcoin quickly then betting is the right choice.