I'm rooting for Rossi. I don't know why he hasn't had decent qualifying times, though. It would seem that he has spent many races clawing up through the pack to get on the podium.
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I'm sure if you can find the answer Valli will invite you to his ranch and Yamaha will sponsor your tires for life.
I'm guessing (only guessing) that Rossi has an internal risk-o-meter developed over twenty years which is tuned to the idea that putting oneself at risk in qualifying means not making the starting grid. Crashing in the race is bad; missing the race is unforgivable.
I'm a Rossi fan through and through. He has always shown class on and off the track. Maybe it is politics or maybe he is a genuinely nice person. Whichever: he is good for the sport.