[grobdriver]

An equatorial launch complex offers the opportunity to decrease the amount of fuel the rockets need to reach geosynchronous orbits — often the preferred location for satellites — by as much as 20 percent or more, lowering the cost of each launch.

Seems this savings would be more than offset by the expense of getting all the equipment, personnel, material (and the fuel) down there.

I have to believe they've already applied all this to a spreadsheet and are satisfied it offers a savings... but I just don't see it.

[KC_for_Freedom]

One other possible cost item is that the US may be imposing environmental fines — or be close to taking this action.
Brazil probably not so much.