Much like the old motto that ideas are cheap, implementation is hard. The answer is simple, put the money(measure) on what you want done. The implementation i

Much like the old motto that ideas are cheap, implementation is hard. The answer is simple, put the money(measure) on what you want done. The implementation is hard. Not being a guy with a sales team it is all arm chair from here. You seem to want to push proactive sales so put the money there at the sign up add a how did you hear about us. If they indicate an advertisement then a sales men would have to show substantial effort on their part to claim commission. If they claim a salesmen then they automatically get commission. If they don't claim anything then salesmen can claim with some effort. If a salesmen pushes an ad then he gets reduced commission for everyone the ad brings in.