Of course DRAM manufacturers are taking advantage of the current situation, they're companies and making money is what companies are for. The problem is that DRAM manufacturing works in boom-bust cycles, building a new factory is capital intensive and slow, so additional supply will come too few and too late to press prices down to a sensible rate above manufacturing costs.
But since it’s a global market the missing supply raises prices everywhere…
Each show has a set number of seats... it isn't an artificial monopoly, it is an intrinsic monopoly. People don't want to just go to A concert, they want to go to a SPECIFIC concert, and a concert venue only holds a set amount of people.