On User Registrations

On the old site, a user registration would be automatically deleted after 24 hours if it wasn't confirmed.  Drupal doesn't do this, so now I actually get to see all of the accounts that are registered but never activated.  There seem to be a lot of them, but I can't say if this is unusual because I never had a good grasp on how many is a typical number.  But it feels like a lot.

I'm also seeing actual successful registrations happening at a significantly higher rate.  This also seems a bit odd.  I could understand the boost in registrations after the site was upgraded, but that was almost three months ago.  The novelty should have worn off.

I'm not complaining, mind you.  Just curious.