They state in their blog:
One of the unfortunate downsides to explosive growth is that you find yourself running into new and unexpected limitations. As a result, AuctionAds has experienced some unplanned downtime as we have grown past our most optimistic projections. We know that downtime is unacceptable, and we’re working hard to prevent any outages in the future.10 days would be enough even for me to either shut down the server completely or move to an other host. If they don't, well I will change to some other reliable ad server. I'm using a wide skyscraper which results in loss of some good advertising space.
I leave you with two quotes:
"If you cannot accurately predict the future then you must flexibly be prepared to deal with various possible futures." --Edward de Bono
"Those who have knowledge, don't predict. Those who predict, don't have knowledge." --Lao Tzu
Personal rate: 7/10
(The 7 is just for their lovely idea of presenting auctions as ad material)