Why is mahr high in some areas and not in others.

From what I am seeing online is like £10k is a norm.

But I live in a town in the uk and any wedding I’ve been too it’s never ever been more than £500-1000 I have never been to a wedding where it was more than that. In my community that’s the last thing that comes up and it’s not even a big deal.

Is this just an online exaggeration or in cities is it actually more expensive. Nobody bases it off of what the man earns whether he’s wealthy or not?