i can't find mine but i remember when i was nearing 10000 i asked makanix if i should make a topic about it and i think we both agreed that i should, however instead of just "oh look a number" make it "oh look a number and the forum members i thought meant something to me and how the time i spent here wasn't exactly for naught"
so yes its understandable that such an arbitrary number shouldn't have a topic made about it, but i think if you try to reminisce on the old years and you and others have a little fun there's no harm done. however to me it's just forum tradition now to see a topic like that pop up once so often