Dota 2

To expand on my title, I see the darkest dungeon announcer and megakill for sale in the marketplace. My understanding is they had to pay for those items directly in order to buy them, and leave the item bundled so as to sell them on the marketplace. Does that mean that people are buying some of these items in the hopes that they can resell them for more later? Or are they somehow able to rebundle items they purchased directly, to sell it for steam creds?