Zipping from Guatemala to Mexico

From CNN

It may not be legal, but it's definitely popular. For just 10 Guatemalan quetzals, or 15 Mexican pesos (the equivalent of just over a U.S. dollar), you can pay to ride a zip line across a river and into a new country.

A news team from Mexico's Televisa network, a CNN affiliate, found four zip lines crossing over the Suchiate River, which serves as part of Mexico's southeastern border with Guatemala. They observed people crossing into Mexico in broad daylight, apparently not worried about immigration authorities posted not far from there.

Guatemalans on both sides of the border are in charge of the zip line and collecting money from people willing to cross.

I wonder if they charge tourists extra.