With the launch of the DSi in less than a month, the DS is showing no signs of slowing down.  As of March 6, Nintendo shipped the 100 millionth DS system to retailers, representing a “significant milestone in the life of this franchise”.  Nintendo also goes on to say that 83 titles have crossed the 1 Million sales mark, while 3 have passed the 10 Million mark.

I myself have helped the sales by buying both a DS and a DS Lite, and I have plans for the DSi as well : )  What percentage of these sales can be contributed to people owning multiple DS systems?