Requesting a room change at check in desk

[Forevermarypoppins]

Has anyone ever requested a room change at the check in counter on arrival day for a room(s) that would be CHEAPER and gotten their request and a refund?

I'm chuckling to myself because I've read so many posts over the years from people wanting to know about upgrades and I actually want a step down but if I can't get 2 rooms next to each other then I keep what I have.