As I am relatively new to this my view is based on what whould work for me, SFI is based on the building of an extensed member base (affiliates) and excelent range of products that is needed by every body. The kind of competition that will work in such an environment would surely be the one that stimulate participation with the least amount of effort. To see who in your downline get the most VP, or PSA's every week could be some criteria for a competition.