Can't sell Steam Cards, Can Sell Booster Packs?

What has changed with Steam Marketplace, and/or my account, that would prevent me from selling Steam Trading Cards (can convert to Gems)?

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Can you sell booster pack Steam?

As you level up your Steam profile, your chances for earning booster packs also goes up, which is an incentive to obtain more cards, to craft more badges, and to level up your profile. You can sell booster packs with or without opening them.

How much do booster packs sell for on Steam?

The cost of a booster pack, in gems, is equal to 6000 divided by the number of cards in the chosen game's set, giving a possible price range of 400 to 1200 gems.

What do you do with booster packs on Steam?

Every time someone crafts a badge for a game a booster pack is created and gets randomly assigned to a user who is eligible for it. The higher your Steam level and the more games you own that are eligible for booster pack drops, the higher the chance to get one.

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