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.