Why is it cheaper to collect international passport in the north than in the south? Is there any logical explanation for this?

Because demand for passport in the North is much less than the demand in the South and Southerners add more corruption to their cost than the Northerners do.

It's not right that passports cost more in the South than the North, and should be further investigated and exposed so we Southerners stop being exploited.

Corruption! Meanwhile, fellow Fulanis from neighboring countries don't need any passport to port into northern Nigeria because there are many leeways for them already.

Truth be told, it is based on the greed of the south and the States with the worst greed cash out higher esp ANAMBRA