It is all about what you can comfortably afford and where your are in life.
If I was making $500K/yr or more I would have a much nice system.
Enough is what you can comfortably spend without worrying about it or going into debt. I have had guys borrow from their credit cards and home equity loans to purchase used audio equipment from me. I can't understand that.
I think the people who focus on the $ spent on a piece of audio gear tend to have the smallest music collections. ymmv.
So you guys are saying I should have more than my 10 albums to listen to??