When I joined Imzy, the very first thing I was told, was to use this reward system. But you are saying that it is just a tinniest part of the whole. To me, it seems contradictory because otherwise a tinniest part wouldn't stand out up front.
I am not necessarily against this system (tiny or otherwise), but Imzy clearly seems to have an issue establishing its narrative properly. I recently read or heard somewhere, that it is psychologically proven, that if you tell someone what to do, they won't like it (or they'd do the opposite). You give people unconditional choice, and they won't go home regretting, even if they'd do what you want them to do anyway.