My other motivation is making sure I understand what offline LLMs can do... while I use GPT-3 and 4 extensively, I don't want to send something over the wire if I don't have to (e.g. if I can summarise e-mails locally, I'd rather do that than send them to OpenAI).
It's also surprisingly good at defining things if I'm somewhere with no internet connectivity and want to look something up (although obviously that's not really what it's good at & hallucination risks abound)