This MC is kinda like naive pure hearted brat that got summoned from another world, that doesn't really know how the world work. Just take the damn money and be over with it, simple as that. It's like someone indebted to you and want to pay back with money and you keep refusing it, you might think it's nothing at all, but you made the other person troubled, not to mention it'll just prolong the debate. Just take the money and everyone will be happy, you refusing it will just make more problem, especially if the other person is stubborn.