Shiny Treasure ex pack expected value

Is a Shiny Treasure ex booster pack worth opening? Expected value $2.81 per pack against a $19.96 pack price, from live card prices and pull rates.

Expected value per pack: $2.81
Booster pack price: $19.96
On average a pack is worth more kept sealed.
Packs per box: 10
Chase cards with live prices: 167
Chance a pack contains no chase card: 56.5%

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