nice collection, it is difficult to earn 1 BTC in one month

of course it's difficult. even when using other way, such as sigcamp or trading,
get 1 BTC in one month is not easy

It is not difficult if you are Hero Member in a good signature campaign...

As a hero member you can collect 0.15-0.3 or 0.4 from sig campaign and Twitter campaign but 1 BTC is not possible .