Yes Traditionally only the groom side gives dowry because the bride marries into the grooms house so the groom has to prove that he can provide for her and any future kids they'll be having together.So only the boy's side gives gifts? (dowry) The girl doesn't have to reciprocate with anything? Because Karakade is supposedly not poor (this is said during the mosquito nets episode & someone said they know she's rich) and Kosa Ban acting on her behalf should have brought anything like a token?
Remember the scene Reung went to court Junward? He brought gifts and the mother told him that there's no place to put It? He asked her how so when the house is empty. That hurt her because everything of theirs were convesgated but then he asked her to allow him to fill the house as it once were filled. That gave her an assurance that he can provide for her and their family.
So with that supposedly dowry is an insurance given to the bride parents that their daughter will leave well. It is also to thank the bride's parent for raising and providing for her til she leaves to build a family of her own. Bride's don't give cus parents usually live with their sons.