As promised I expand on what I planned to write as a comment.
The fact that they might be more expensive (at least in certain areas) wasn't the speculative part. I just don't see that there is a way to answer this question as this really is more a philosophy or economy question. And then again I don't see where it fits into the FAQ.
Although equipment questions basically are on topic here, we only cover usage and safety questions, not why companies do their pricing how they do.
The next problem is, that possible answers might not last very long. There are regional differences and depending on trends the validity of answers will likely change.
I hate to say that a question is not useful, in fact I think every question can be asked. But before asking you should think about the right place. I think the fitness site is the wrong place to ask for, you can always join chat for questions you consider too borderline or localized for the main site.
We happily accept discussion topics there and even off topic stuff. It might take some time until someone answers, but you are likely to get an answer.
For the localized part:
I just checked Amazon and a 16kg kettlebell costs 34€ where I would pay 25€ for 2x5kg barbell plates (rubberized cast iron). So for me the difference doesn't seem to be an issue.
Then again our site is thought to help you improve your fitness in some way. Even if there was a perfect answer, it wouldn't help you with that, but give you a complete overview of the manufacturing, the shipping process, taxes and so on.