system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Why would a Sith Lord even take on an apprentice in the first place?

You're taking on someone who's eventually just going to try to kill you, you're literally teaching him how to do it, and you know this because you killed your own master. His eventual attempt to murder and supplant you is baked into your religion. So what's the point? It seems like there's no upside if you're the Sith master.
gpt
The Sith must live on so they can enact revenge on the Jedi. If your apprentice grows stronger than you, that means they are more worthy to rule the Sith. And if you never take an apprentice than the Sith die with you.