The biggest reason is that pricing is not part of local culture. Politics is. To take this a step further, it doesn't matter where you enter the country, even

The biggest reason is that pricing is not part of local culture. Politics is. To take this a step further, it doesn't matter where you enter the country, even if it is a place where the people are generally nice and specifically sympathetic to tourists getting detained, the first person you're dealing with is an LEO at border control & they are all following the same orders. They appear to be going out of their way to look for reasons (on your cell phone, tattoos, etc.) to send you back home. God forbid you have a run in with another cop after you've entered the country...