If i get 40$ bitcoin every month, at first may be i'll hold all of it for several times. I do that because this is time when bitcoin's price relative going to high. For me better to collect it until enough amount while creating plan to trade it.
Slow down and read the thread. It's 40$ a day not every month.
I will go for gambling and try to make quick money from it and who knows if luck comes in my support then I can even make $400 out of it in a single day and if it really happens then I will invest those winnings into altcoins to make profits in future and it will also decrease the risk of loosing.
This is the thing about gambling that makes people hooked. It gives us the illusion that we can do anything in this world "if we could just make quick money from gambling." In reality, you'll try and try to earn money from gambling but you'll never win.
Just looking at your post, your thinking has snowballed from "trying" to make money from gambling to trading altcoins using $400 that you've made from gambling. You haven't even placed a bet, but you already have fantasized what are you going to do with the money that you'll win someday.