I guess since this thread was bumped (Kaiko, please don't bump every thread with stories about your game. We have the Misc. Stories board for things like that), I should make a few notes about townie graves, for anyone that stumbles upon this thread.
- This might have been a recent patch, but townies usually will get a tombstone only if someone in your household was friends with them, or disliked them heavily. Generally, it's for those sims that you get the "(x) is getting pretty old and won't live forever" notification for.
- Unless the townie dies on your home lot, their tombstone will be whisked away to the mausoleum or deleted entirely (again, depending on your relationship with them).
- If you play with Twallan's Story Progression, then every sim in town gets a tombstone when they die.