Are you looking to buy a Ball Python?

[ballpythonsrock2]

Adults are typically more expensive and its not as easy to find specific morphs.

If someone is looking for a specific morph than your right they should probably look for a juvenile. The adult ones would be more for someone just looking for a normal pet or inexpensive one.

I stated some advantages but I guess there's cons as well. An ill tempered snake from a rough up bringing
or neglect is a definite con possibility as some have stated.

[Bogertophis]

... An ill tempered snake from a rough up bringing or neglect is a definite con possibility...

We should always consider that a 'grumpy' snake might also be in some sort of pain (like, when handled). They're so stoic, it's hard to tell, but something to consider.
They can have back injuries, for example, caused by improper handling (like from being dropped or snake grab tongs), but how many think to get an X-ray to find out?