The art market may be booming like never before, but at least one high-profile collector says the thrill is gone. Boston art patron Kenneth L. Freed is selling off more than 800 works he amassed over the last two decades, saying that the art world has changed for the worse. “Where once young artists searched desperately for a supportive patron, now they find themselves quickly thrust into high-profile shows. Deep-pocketed collectors compete for the latest, greatest new piece.”