Yup, prices for all toy lines have gone up across the board.
I think because there were so many clearance sales way back in Yamato's heyday and people got used to those sale prices that once Yamato went under (turns out their business model wasn't great for solvency) and Arcadia had to move to a business model that would allow them to actually stay afloat that a bunch of people decided Arcadia was way overpriced and wanted the pricing back from the Yamato days.