Why is the Yaris with factory alloys so rare?

[eht13]

To further address the original question regarding the rarity of OEM / factory alloys... I just used the Toyota site to look at all of the 2010 5-door HB's currently or soon-to-be available at dealers in my region (assuming it's complete/accurate... not sure). Maybe this would be different for sedans or 3-doors, but NONE of the 5-doors are equipped with OEM alloys... not the 5-spoke or 8-spoke designs pictured in my earlier post. All of them are steelies/wheel covers, except for a couple that are available already equipped from the dealer with one of the two Enkei wheels below. Odd that dealers are selling some pre-equipped with an aftermarket wheel as opposed to an OEM one. First wheel is 15", second is 17".