Good proposal!  Price seats more accurately according to demand and the profit margins are squeezed for brokers.  Unfortunately, this works well on paper but not in real time.  Raising prices means that some fans are not going to be able to afford tickets, a problem most artists don't like seeing.  Dynamic pricing has been tried for some sports tickets, where prices rise/ fall with the teams performance (and demand.)  Inevitably, you will find fans who pay $100 and will be ticked when they find the fan next to them paid $40.  Works great with hotels and airline tickets.  Not so much with concert tickets.  Something that you are seeing more of with Ticketmaster:  VIP seats.  An allocation (but not all of them) of some of the best seats are often priced with a premium and closer to the true value of that seat.  Its harder for a broker to squeeze the profit out of a $1500 front row seat than an identical seat priced at $100.  Hit up my startup and get presale passwords: roostr.com