Opening Temporal Forces Pokemon Center Elite Trainer Box (Exclusive) [Walking Wake] returns about $49.48 in card value against its $201.81 price — roughly $0.25 back per dollar spent. On current prices, you lose money on average by opening it.
See every card and pull rate in Temporal Forces
How expected value is calculated — card value only, from published pull rates and daily market prices.
Temporal Forces Pokemon Center Elite Trainer Box (Exclusive) [Walking Wake] on TCGplayer