For me I'm wondering about ISP overhead. When I rent a VPS I'm more confident in their uptime and that all the funky dns shit I'm less confident in will just work. I run a home server as a hobby and I had to do all sorts of weird negotiating with my isp to make sure I always have uptime. Then my shitty modem that the isp refuses to let me replace randomly resets my forwarded ports once every 6 months or so. Etc just weird shit like that.

I guess if I was investigating commercial options I'd have the "trunk" sorted at the office with a commercial isp solution, static IP, good IT hardware maybe, but from what I know at this exact moment if a client needed hosting I'd always go straight to renting a vps.