Had a quick look for Nights into Dreams data and was shocked at how poorly it sold on XBL. Just under 6,000 for its first month. Not to sure about PSN figures but id say they wernt much better. Such a shame.
http://www.gamasutra.com/blogs/RyanLangley/20121114/181545/Xbox_Live_Arcade_Sales_Analysis_October_2012.php