You have to do extensive promotion to get referal under you who actually activates as it is hard to get anybody to pay 22$ for membership only. So overall cost of advertising will be more than your income from referals. I like to remain quite far from this type of pyramid structure.
It is indeed a lot of hardwork and promotion to get people to sign-up and activate. However I've also known people who joined MLMs such as Forever Living Products, USANA, JEUNESSE, etc who paid hundreds of dollars for a membership and yet earn a tiny fraction of that in commissions. I usually stay away from MLMs / Pyramid too coz I don't know how to sell lol. This happened to be the first one since it's all about bitcoins and I thought it's not too bad to try with $22.
But the site is offering nothing other than the information you can fer in this forum. To top it off the information provided is only their opinion of the information. In that case you might do one better and make a membership site that links to forum information to save you time from rewriting the information and charging $4 or .1 BTC for the site. The referral levels would look something like:
Level #1 - .02 BTC Per Referral
Level #2 - .005 BTC Per Referral
Level #3 - .003 BTC Per Referral
Level #4 - .002 BTC Per Referral
Level #5 - .001 BTC Per Referral
If everyone gets 5 referrals, you would receive 4.975 BTC. And you did nothing buy put together a information site with public knowledge information.