Because he marketed them way to hard almost twisting the truth of their gains. It also didn't help with the early dynos not showing the gains he stated. Then the ones that did, people seen problems in the charts. Then there was the shearer/passion grudge races that never happened, then you had shearer say he copied half the pipe.
They had the worst start for publicity.
Yes the new dynos show they are better, but not the major gains as promised.
Id still like to try them, they look quality. And from the new dynos they look like they pull hard from the start. But I still dunno about them.