Then this story http://www.heraldsun.com.au/technology/familys-are-being-hit-by-hefty-bills-run-up-by-children-playing-iphone-and-ipad-games/story-fn7ljlpi-1226442976218 and I am sure there are many others where people have been caught out
You don't rack up big gaming download bills with a Nintendo DS or Sony PSP and the graphics are "way better". You only pay once on their games and in the case of DS, the consoles are fairly heavy duty for kids unlike the broken screens of smart products.
Games can be resold, if you keep them long enough you could get your money back or even make a profit especially if they are limited editions. With Gametag you won't lose your game cartridges.
How interesting these stories are on the "smart devices" and their free downloads. My kids love their DS and PSP we don't have this issue.