All DS games may be created equal, but not every DS console is created equal. Especially when it comes to screen brightness. Just look at this comparison pic (click through for a bigger version)! On the top, the original DS. Bottom-left, the DS Lite. Bottom-right, the new DSi. Nice to finally see where some of that decreased battery life is going. Nintendo DSi Impressions and Comparisons [1UP]
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While I doubt they're going to get any complaints about brightness from morning commuters, I still imagine Nintendo will have a tough time justifying a ($50) higher price tag on a unit which falls far short of "DS 2" status.