Best is continuously sponsoring new affiliates, then concentrating on coaching and helping, the ones that last and do not quit, build a successful business in SFI.
You cannot just sponsor fewer PSA's as anyone long enough here knows that not all of them stick, some who work for sometime just do quit. So it is not guaranteed that the fewer PSA's will last.
Best is to continuously sponsor affiliates. if it takes more time to coach and help them you got to.