Yea, when you help your villagers, if you give them something rare then they will tend to give you back something also rare.
Once I had a fun trade which ended up in a profit of a throne and 200,000 bells...
View attachment 145072
So Ankha gave me her throne....
View attachment 145073
And then Drift bought it for 200,000 bells....
View attachment 145071
and then he gave it back to me!
Easy money