These days it only cost you 19 BTC per week. But you have to be very active. A min. of 60 minutes to an hour per week.
If you can do that, potentially you can become a very wealthy man, if you've got 60 minutes to an hour per week of free time.
I think it's the easiest way to get rich online not all internet marketer and experts on seo can earn that,especially now that bitcoin can double or triple in a few months ..