I don't see the point of comparing their sales at all. I have two kids. That's two GBAs, two DS and two PSPs. 1 PS2 and 1 PS3.
Friends with more kids its the same - 1 console and x times kids handhelds.
I also see a lot more multiple handheld purchases (particularly when your kid drops them!). So while we have 2 GBA's we've bought a fair number more.
Seems to me the handheld market is still a fair way off potential maturity as assuming a majority of gamers get handhelds then if a console can sell 100 M you'd expect a handheld to be able to get to 160 M at least assuming a reasonable percentage of gaming households would either have kids or people sharing a single console.
Try to be reasonable... its easier than you think...







