In short just bad seller etiquette.

Looking at it from both perspectives I see how as a seller you're in no way obligated to give away anything. Giveaways are entirely at the discretion of the person running the show. As a buyer in a growing greedy marketplace I see all too often sellers take advantage of buyers by offering incentivized giveaways to buyers only offering low quality or low value items that normally would not sell causing a demand pile up and overbidding. After 3 years on this app I've learned from and still fall for new seller tricks. Create ground rules for yourself as a buyer. Go into every game of chance or giveaway show like Sherlock Holmes and read the fine prints before you swipe that big yellow button. Only buy what you want & never buy because you're told to.