Because people have fun creating those sorts of setups. There are many tutorials for those setups, the hardware can be found relatively affordably, and it isn't something someone needs to have experience in enterprise networking to build. The purpose of the hobby is to have fun. If you aren't having fun, or if other people's fun is ruining your day, consider finding a new hobby. I suggest fly fishing. You could probably use more vitamin D.

> You could probably use more vitamin D.

Nah, I get enough of that from being by the pool, managing my home lab.