About Art-bubbles in the "Director" wrote not so long ago:
http://www.artinvestment.ru/invest/20070815_ugrozy.html
To "go bust" should be a protracted process krizistny in the economy. While it is not taking place can be measured in part, as "sterilization of money" in the arts. In general, prices rise and expansion of the circle of collectors. More super-rich people are truly interested and enjoy the resonance purchases. So in this, too, is part of the explanation.