I'm struggling to find reasons to buy some visual novels here on GOG. I want to, but JastUSA is offering the same games for way less.

Both companies have localized pricing, and still Jast has a better deal.
Today I wanted to buy Yokai Busters and Ghost Girl Lasling.

Yokai is 7.68 USD in GOG vs 5.27 USD in Jast, both with 20% discount.
Lasling (+soundtrack+ASMR) is 16.67 USD in GOG vs 11.87 (deluxe edition) in Jast, and GOG ver. has 20% discount while Jast doesn't.

This isn't the first time this has happened; Dreamcutter, Dungeon Vixen, Tenioha. I bought them on Jast because GOG was more expensive.

There are some VNs GOG has that Jast doesn't, and those of course I buy here. Specially from Kagura Games or Itch.io-based.

I want to make to this post so hopefully GOG workers see it and note that something is maybe wrong with the regional pricing. I'm from Chile

Ask JastUSA .

by the way : you get those games cheaper than me . Yokai Busters is 11.89 euros in here with the discount .

Can't comment on regional pricing. But GOG is a middleman and takes a ~30% cut. So by simple math, Jast would have to sell 1/0.7 = 43% higher on the GOG store to get the same revenue as if someone bought on their Jast store.

And again, publishers have final say on prices here.

JAST USA probably has way better connections to the Asian Market than GOG ever will.