Well, Brazil have variable weather along the variable places, since it's the size of a continent. Some are very dry, others are wet or extreme wet (like near Amazon Forest), others are in the middle.
I found the cost, buying the bricks, it's 30% less for ecologic brick house than a standart brick house, but I don't know if it's for a home with finish plaster walls or not. Anyway the amount of plater of cement mass required it's reduced, since the ecplogic bricks have very good shape straight, well alighned and fine in edge gaps.
If you do your own ecologic bricks the cost for the bricks it's reduzed a lot, maybe 1/3 or 1/4 for brick's cost.
Portland cement on USA it's about double the price than on Brazil. Ecologic bricks are not good idea for very humid climates, but wikepedia said they can use varnish to protect the bricks.
"
Finishing
Completed walls require either a reinforced bond beam or a ring beam on top or between floors and if the blocks are not stabilized, a plaster finish, usually stucco wire/stucco cement and/or lime plaster. Stabilized blocks can be left exposed with no outer plaster finish.
In tropical environments, polycarbonate varnish is often used to provide an additional layer of wet-weather protection."
https://en.wikipedia.org/wiki/Compressed_earth_block
Maybe with two layers of such varnish, it can hold well. But I can't be sure. Maybe require a new layer of varnish after a given number of years. Also I'm not sure if the plaster finish for interior and exterior walls solves the problem of moisture.