What are the advantages of Model inheritance?

Other than the convenience of writing them, I can't seem to find any
advantages of using model inheritance.

Please allow me to explain the trouble I am having with an example.
Suppose,

class Post(models.Model):
title = models.CharField(max_length=200)
user_owner_id = models.ForeignKey(User)

def __unicode__(self):
return self.title

class BetterPost(Post):
description = models.CharField(max_length=200)

def __unicode__(self):
return self.title

Now, in the template:

{% with profile.user.post_set.select_related as posts %}
{% for post in posts %}
{{post}}
{% empty %}
No posts!
{% endfor %}
{% endwith %}

{% with profile.user.betterpost_set.select_related as posts %}
{% for post in posts %}
{{post}}
{% empty %}
No posts!
{% endfor %}
{% endwith %}

If there are 2 'Posts' and 1 'BetterPost', the template code will
print all of the posts in the first loop, then none in the second loop
set.

So why would I use model inheritance if this is the kind of behavior I
can expect? If I can't get a set and can't access the fields, why
wouldn't I just copy the fields into BetterPost rather than extending
Post?

Thank you for reading!
R

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