Is the county advertising company profitable?

There must be a profit. I'm in advertising. Let me answer your question first.

I run an advertising company in the city and often receive business from some county towns. So I wonder, why do these customers go further and further?

Later, I asked these customers to know that it is much more expensive to find an advertising company in the county than in the urban area. According to their descriptions, I think many of them are about 20% more expensive than urban areas.

There is a profit. The county seat is a smaller version of the first-tier cities, and it also needs publicity and marketing. Sometimes small places have greater commercial value.