Earlier quoted context omitted.
Colo costs are just insane compared to consumer prices. At home: 12 or 42 €/month (details¹), depending on whether I want gigabit upload or not. Advantages: - fast LAN speeds, - don't need to go anywhere to do hardware maintenance/replacement/additions, - low cost, - partially solar powered if you have solar panels, - don't need to make things fit in a rack (can be a raspberry pi, an old laptop, or whatever you like)…
Does your ISP allow you to use their service to host a server? Most expressly prohibit it in their terms and conditions.
There are also ISPs that expressly encourage it. Formerly I was with XS4ALL who encouraged it when I asked them on the phone (long time ago), nowadays their spiritual successor is Freedom Internet. I think the name says enough :)