Unfortunately EVERYTHING in America is marketed towards children nowadays, it just seems to be the most profitable way to go for companies, even though it might be something thats for everyone, it is still mostly targeted towards children. Look at the Ipod, its mostly kids you see carrying one around (at least here, what 8 year old DOESN'T have one?), but that doesn't mean that adults cannot own one. The Nintendo DS, again, its mostly kids using them here, but there are also games for adults on it that only adults would enjoy. This is the same for the PSP, most people I see with them, are children. Same with Cellphones, I have seen phones marketed specifically for children, yet a few years ago they were only for sophisticated adults. If I believed this marketing, I would probably drive myself nuts!
Also, they are cutsey and girly because they are a Japanese toy. Everything in Japan is like this, so thats why the website is like that and the packaging and stuff. In Japan its perfectly acceptable for a 40 year old woman to have hello kitty merchandise, and its normal for businessmen to be seen playing Nintendo DS on the subway, so they do not subscribe to the belief that everything that looks cutsey is childish, as America does. They will probably never change the image though, since it the toy originates in Japan.
I also think there is too much pink though, but we do need pink ones because they sell out fast and if there wasn't enough pink, then the prices for the pink ones would be really high and they would be hard to find, so if you wanted a pink one, that would be bad.