It's all about supply and demand, man. Aside from the inevitable price boost caused by the illegality of the whole process, dealers will charge what they think makes a fair profit, and people will pay what they think is a fair price. If everyone stopped paying for the really dank buds, dealers would be forced to lower their prices.

Or, you could just buy in bulk. I'm saving my monthly weed money for the next couple months so I can buy a bunch at once and save a whole shitload of money.