Me want to make choo choo

From FAQ:

Why is there a limit to the number of gifts I'm able to give away?

We limit the number of gifts a user can create for security purposes, and to prevent a new user from potentially posting a large number of invalid gifts to the site. When you create giveaways and your gifts are received, this number will increase, and you'll be rewarded with the ability to create giveaways with a greater number of copies, or more simultaneous giveaways.

Sometimes support can temp. increase your max. of ga's. But with good reasons.

You start with the ability to create 3 giveaways and you gain 1 additional giveaway slot for every 3 games you give away that get marked as received. If someone marks your giveaway as "not received" or you cancel a giveaway before it ends, you will lose 1 of your giveaway slots.