"How many affiliates do I need to sponsor each month to build a successful business?"
In my opinion; it's not how many you sponsor, it's the quality of your team members that you sponsor.
To put a monthly number to this would be very difficult. You could have 1 team member that is dedicated out of 10 or it could be 1 out of 100.
If you are providing your team members with ample guidance, advice and encouragement then you are doing your due diligence. At this point, it is up to your team member to be active and committed to building their business and team.
Our goal is to get to 5 PSA's that continually reach EA then strive to climb the ladder to BTL, STL and so on. This is what will help gain the commissions that we are looking for.
Hope this is helpful. Wish you the best of success.