For us at SixLeaf, promotions are still working for our clients and they are still improving the keyword rankings for their listings daily.
It is getting more and more popular for sellers to run their own promotions to email lists or social media. If you are new to running social media ads or unsure of which keywords to target for how many days, it can severely affect your promotion.
While we do not know the intimate details of everyone's situation, we can only conclude that the promotions are not being setup properly. Meaning that there are not enough sales per day per keyword, in a short enough amount of time and not achieving the desired rankings for the keywords targeted.