This reminds me of Casey Casem. He used to read those during his countdown shows. I never did it but I always found it to be good filler material.
Instead of being filler material, it was like must-have program at the time. Requesting songs was the secondary goal. Sometimes not all messages could be read because the air time was not enough. I remember there was an event where the person who made funniest message won a gift from the station.