I know someone from IVOAC who is and these cars are definitely not going for cheap but they'll definitely devalue the USDM ones here.
I'm not sure how much they would devalue here considering the USDM models had more power and better/strong turbos.
The nicest thing about the JDM Supra is that you have the opportunity to find a mint condition low mileage example if you're willing to pay the price.