Opening Scarlet & Violet Pokemon Center Elite Trainer Box (Exclusive) [Miraidon] returns about $35.27 in card value against its $317.06 price — roughly $0.11 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Scarlet & Violet Base Set
How expected value is calculated — card value only, from published pull rates and daily market prices.
Scarlet & Violet Pokemon Center Elite Trainer Box (Exclusive) [Miraidon] on TCGplayer