Because both hobbies involve buying expensive toys.
And in both you can build your own.
And still get very good results.
This was my first attempt at a 8"/f6 a few years ago.
Then upgraded the mount, and took pictures like the one beside it.
Now, more of an appliance operator, with fairly expensive mounts, scopes
and cameras. ( well, expensive for me.... certainly didn't spend Yaesu FTDX9000D kind of money )
Can sit inside the house and remote control the scope and camera. talk about lazy.