The word spillover implies something for nothing. This will attract people who are looking for exactly that, something for nothing. Following such a model is a recipe for mlm failure.
Such a welfare mentality will not help. You will be forced to build under that person, and likely fill a downline full of people looking for an easy way out.
Another thing to avoid along these same lines is any program that tells you they will "pay your way in". The same thing applies.
What is to keep these people engaged? Nothing, they never were engaged. People will drop out as fast as they come on.
Something for nothing does not exist.