I manage a hotel and while this would be a small help towards marketing, you're just gonna forget about that duck in when you get home. Maybe you post it on social media or tell a couple friends. Really I am way more interested in the positive impact a small gift like this has with guest satisfaction scores and guest/staff engagement. I bet tons of people talk to the front desk about the cute duck which might give us a chance to recommend a good restaurant or solve a minor issue the guest might not have mentioned to us. It's a unique ice breaker to start a relationship between the staff and the guest which is incredibly important for achieving high guest service scores.