Presidente is a symbol of national pride, a very difficult task to take on for gaining market share.
I can remember the many different beers that sought to gain share the same way: come in and buy share with cheap prices below net cost, gain some traction, then raise prices hoping to retain most of the gained share. And as soon as the prices get raised, their customers go back to Presidente.
It's a nationalism thing.
I don't think the DR is a "craft beer" market. Then again, I don't see may "man buns" or lumbersexuals here, either.
That said, occasionally Nacional has craft beer on sale, I'm supposing because they can't sell it otherwise. I bought some Blue Moon that way, steeply discounted. Yum.