I was a member of Stiforp for just over two years. I paid a monthly premium and even paid to upgrade to 3 Star ranking. I won't disclose the cost involved over the period of time, but non of the promises were forth coming. First promise, you never have to sponsor anyone to earn some form of re-numeration, Secondly, with the number of people joining in the thousands you will get spill-over into your team. "You never have to sponsor anyone to earn a commission".
The websites, autoresponders and landing pages are good to look at and try to promote, but no have ever worked for me in the two years as a member. No commissions and entitlements. In fact my last visit to my home page I found I has lost the 3 Star ranking which I paid for some twelve months earlier, and with no notification of any changes.
Questionable activities to say the least.