Opening Obsidian Flames Pokemon Center Elite Trainer Box (Exclusive) returns about $39.19 in card value against its $631.59 price — roughly $0.06 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Obsidian Flames
How expected value is calculated — card value only, from published pull rates and daily market prices.
Obsidian Flames Pokemon Center Elite Trainer Box (Exclusive) on TCGplayer