Opening XY - Fates Collide Sleeved Booster Pack [Mega Alakazam] returns about $11.91 in card value against its $47.80 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 XY - Fates Collide
How expected value is calculated — card value only, from published pull rates and daily market prices.
XY - Fates Collide Sleeved Booster Pack [Mega Alakazam] on TCGplayer