He says “I’m glad this place hasn’t turned into a dungeon yet,” implying it will in the future. If it has turned into a dungeon, his “uncle” would be getting a lot of money, and he probably doesn’t want that. So he’ll give him money that seems like a lot, but is much less compared to the value of the dungeon.
Also, the blonde is like, “no one will look down on you if I introduce you”, but that’ll be true regardless because he’s the rank 1 player. It’s a nice touch of dramatic irony.