The "Post your latest oil change" thread has been running for nearly three years now.
I always post mine, and I find it entertaining to see what oil and filters people are using, as well as what kind of OCIs they're doing.
BIU also makes a good point, in that you could use the thread to identify people with cars similar to yours, and PM them about how they liked a given oil in their car.
There are a bunch of different oils available at a wide range of price points, and it is always interesting to try something you haven't used before.
Having the opportunity to PM someone about their experience with an oil you haven't tried represents a useful source of information.