Should Hero cards be marked as collectible?

{
  "Basic": [
    {
      "cardId": "HERO_09",
      "name": "Anduin Wrynn",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Priest",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_09.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_09_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_01",
      "name": "Garrosh Hellscream",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Warrior",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_01.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_01_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_07",
      "name": "Gul'dan",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Warlock",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_07.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_07_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_08",
      "name": "Jaina Proudmoore",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Mage",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_08.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_08_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_06",
      "name": "Malfurion Stormrage",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Druid",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_06.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_06_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_05",
      "name": "Rexxar",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Hunter",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_05.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_05_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_02",
      "name": "Thrall",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Shaman",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_02.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_02_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_04",
      "name": "Uther Lightbringer",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Paladin",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_04.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_04_premium.gif",
      "locale": "enUS"
    },
    {
      "cardId": "HERO_03",
      "name": "Valeera Sanguinar",
      "cardSet": "Basic",
      "type": "Hero",
      "faction": "Neutral",
      "rarity": "Free",
      "health": 30,
      "collectible": true,
      "playerClass": "Rogue",
      "img": "http://wow.zamimg.com/images/hearthstone/cards/enus/original/HERO_03.png",
      "imgGold": "http://wow.zamimg.com/images/hearthstone/cards/enus/animated/HERO_03_premium.gif",
      "locale": "enUS"
    }
  ]
}