1Btc is very much high to make in a month.1Bitcoin means 960$ now.I don't think by trading or gambling anyone can get that amount.So it's very tough and quite impossible without skills.If you have skills like designing, programming, developing etc you can earn good amount by offering these service.Without it I can't see anyway for making 1 btc.
I don't agree with you that a trader can't make 1BTC a month. a new trader cannot make 1btc a month. but an old trader who worked in this field since a long time and have good capital then he could surely make more than 1BTC every month.
It's impossible for a new trader to earn 1 bitcoin monthly. The only thing that it can possibly happen is when he will be guided by an expert trader. But it looks like that he is going to trade not on his own decision but with the help of other trader as well. But the real thing there is that he can earn higher than 1 bitcoin.
Even experts arent able to make 1 bitcoin monthly, currently such income does require a big number of bitcoin to get low risk and be able to get those ammount. Crypto wolrd has whales, if you part of them you will be making even more, but as normal trader you jump in and out anytime expecting proof, but ther isnt a easy way to make such volume nowadays.