I have won 1 buck. I believe that is the highest prize, unless the 40 savii points count. But I have won in total 5 bucks from it, 40 savii points twice, and countless times I have gotten 3 savii points.
3 savii buck icons = 1 buck as prize.
3 savii icons = 40 points as prize.
3 3DSPaint logos = 3 savii points.
3 DSiPaint logos = 3 savii points.
3 Wii Opera SDK logos = 3 savii points.
3 minco icons = 3 savii points.
2 savii bucks icons and any icon/logo = 3 savii points.
2 savii icons and any other logo/icon = 3 savii points.
I believe that is all of them or those of which I have remembered.
Don't argue with idiots because they will drag you down to their level and then beat you with experience.