Inventories can be misleading. They may have just taken delivery of a boatload of cars - or maybe the system hasn't been updated on a timely basis. In my area, granted we only have 1 Infiniti dealership, you have to wait for any FX or G35C model. And the G35 sedans still sell pretty well they say.
Its a shame the Q isn't doing better, as its a very nice car. The M was just a horrible mistake, but as they, its just a placeholder til the new one comes in 2 years. Hopefully they will make it a grue 5-series/GS competitor.