I noticed that with the full body ones they did in the UK (didn't quite get the full set; Toad, Yoshi and toilet Mario I missed), they were okay for £1 though. I guess these are $1.50 without the meal.
If you ask me the karts have too much detail to recreate to a satisfactory standard for that kind of budget so look really cheap. With the full body there are few colours to worry about.
The hilarious thing is that given the Kirby box art edits it really could have looked like a sound marketting plan, not just something to please a group of hardcore fans (of Mario Kart or just games in general.)
Nintendo's no spring chicken to licensing its franchises out for pretty crappy products. Sometimes i feel like it hurts the brand for me. I wanna say they did this with Wendy's back when the Wii was coming out.