I hardly ever risk at all. I'm just not very good at it and don't really feel like learning at this point. Best riskers are: Jose, Nito, Tone, DJ, Maximo. I don't think Lonamer risks as much, I think he just has the best timing on tour.
The best risker of all time tho was TOMO. I think he was just a video game expert tho and not much of a tennis lover.