They will prevent more costly repairs from moisture damage.  

If you run your LLC sloppy from a financial standpoint, any lawsuit will be able to penetrate the entity protection and render it worthless.

If you put a screen on the pipe, and it's cold out, moisture in the air can start to freeze when it hits the screen, which eventually will block the flow of air. 

She has never mentioned to me that the moisture came to her daughters room.

Is the moisture resistant drywall in the bathroom and kitchen worth it?

You want tile or vinyl in the wet areas, such as kitchen and bathrooms to prevent buckling from the increase in moisture. 

Have you encountered any moisture issues so far? 

Once the water penetrates the brick the dry rot begins.

For construction costs I’d factor 200,000 250,000.Things you need to check: Service size of water (might need think of a pressure booster), electrical service panel, spray foam entire home I would recommend closed cell spray foam, since this is higher r value and moisture barrier. how is the structure of the building?

Yet ants are not hard to rid of as they usually arrive due to moisture / food.