As a realtor I'll never do this, This may waste the time of seller, buyers, and agent itself. But in some scenarios, it may help all
There are chances for negotiating the price.
Sometimes may he only want to keep seller happy.
An agent will never want to disappoint their client. He will try whatever he can do to sell the house.
I'll call it a trick of home showing. Doing something is better than nothing. If they can't afford to that house, they may recommend to someone else (word of mouth work here).