If it is through Ticketmaster ... probably just random fans looking to cover their other games. Expect the scalpers/agents are not as transparent. I suspect game 1/game 2 will drive if prices go up or down. If the Blazers are coming back with a split, I wouldn't be shocked to see a secondary bump.
Last round was 52 per seat. This round is 70 per seat. Average ticket sale for game four in my area is $550 per seat. Thats a crazy markup