Right, so many people throughout this thread have suggested the price that Nintendo would need to pay to include a charger being from 50cent > $2 there are a number of things to be considered other than the price of the small piece of plastic which is being sold seperately.

1. In Europe most countries here use a different wall socket, when Nintendo decided to go for the no charger in the box model for the 3ds xl over here it meant they no longer needed to worry about which charger was going into which box, that meant rather than having a bunch of different box shape designs (some countries plug sockets are massive compared to others) they could just go with 1 default EU box model and not have to worry about which country was getting it. This saves money on packaging and administrative overhead since there doesn't need to be a seperate packaging line done per country depending on each countries demand for systems at the time, they could happily just make and box 3ds xl's to their hearts content then ship them where needed.

2. Two electronic devices in 1 box, with the 3ds xl in it's current state being sold in the EU there is one device inside the box, one piece of hardware that needs to be tested and only one point of failure, imagine the scenario where a 3ds would be sold with a defective charger, nothing is wrong with the system itself but obviously the customer needs to get in contact with Nintendo and ship it back complete so that problem can be found, rather than just selling a handheld on its own and allowing people to get the charger seperately means Nintendo are not also responsible for the testing of a seperate rather cheap piece of kit inside the box which could cost them the system being returned, this lowers the time spent checking what goes into the box at the factories since some pieces of paper are hardly going to be defective.

3. This is a tangent from the first point but, 3dsxl's boxed in stores here come in tiny boxes they are just a really nicely designed minimalist cardboard sleave around the essential product, in terms of packaging/shiping/handling/storage of not having to include a almost same size as the console charger in each box means that you can have much larger shipments going out of the consoles that will sell without having to include that accessory in the box, also of course means storage to keep a stock of the consoles in game stores or electronic warehouses costs a good deal less.

and really most important reason to do it in the states would be 4. Europe didn't blow up, they tried it out here, rolled out the XL , some people kicked up a large amount of fuss about the charger not being included, there was threads far bigger than this one on here with even more gif responses to good points, that bycotts would happen and Nintendo as a company who likes to make money (instead of all those other non profit companies we love who make games) were evil and had to be stopped... all added up to nothing.

To suggest it costs just $2 to put the charger in the box tho.... means you haven't stopped to think that you first need to redesign the box to fit your charger and if it would apply which region and power outlet the box is going to.