Terastal Festival ex pack expected value

Is a Terastal Festival ex booster pack worth opening? Expected value $4.35 per pack against a $13.79 pack price, from live card prices and pull rates.

• Expected value per pack: $4.35
• Booster pack price: $13.79
• On average a pack is worth more kept sealed.
• Packs per box: 10
• Chase cards with live prices: 58
• Chance a pack contains no chase card: 77.9%