You have fun. I know I do at any rate. Platinuming games is fun most of the time. Sometimes it's not, because of stupidly ridiculous criteria like Treasure Hunter in FFXIII, or Doombringer in Wizardry: Labyrinth of Lost Souls, but for the most part it's very fun.
If you're not going to share with the entire class, then don't bother sharing at all.