Here is an excerpt from a blog I happen to browse on occasion. click the link below for the full article.
"It's likely that these resale rankings will swing wildly from year to year" says Michael Pachter of Wedbush Securities. Seven of the top 10 publishers are different from 2008 to 2009. Only Nintendo, MTV Games, and Natsume make the list in both years.
According to Jesse Divinich, "Of all the publishers Nintendo is among the top for preventing price protection (discounts at retailers), which is why they maintain a high resale value on secondary markets such as eBay."
There was no variation at all in the console rankings from 2008 to 2009. Wii and Nintendo DS games were at the top of the list in both reports and Xbox 360 and PS3 games were at the bottom.
In general, Wii and DS games have a longer shelf live and sell over a longer period of time so the resale prices stay higher. There are more people buying the games over a longer period of time.
Conversely, Xbox 360 and PS3 games are very front loaded with a much larger percentage of a game's sales occurring in the first month of sales. In the following months used games flood the market as the hardcore games move onto the next big release, which causes lower resale prices.
http://blog.videogamepricecharts.com/2010/01/2009-game-publisher-resale-value-report.html
