Of course worth is relative, and as you said, for you it's a true statement. I have no expensive equipment right now, and for me right now I could never justify $1k on a component. Hopefully in a few years, but for now it's just as absurd for me as it is for you, although for different reasons
You also have to consider your setup. Howard mentioned grabbing an amp, EQ, and speakers, and it'd be "well under 1000 bucks" I'd say that that is difficult if you are going for any amount of quality.
If you are buying a HTIB for a small room, you can do so for well under $1k. If you are creating even a simple 2.1 component system with a receiver and speakers, $1k can happen fairly quickly. If you are buying dedicated amps, preamps, and EQs, as well as speakers... $1k doesn't usually even get your foot in the door. Add in the fact that most modern setups are 5.1 and you increase that even more.
I'm not trying to convince anyone that a stereo is only good if you spend crazy money on it. I believe quite the opposite actually. I'm just trying to say that like most things in life, there are varying levels of quality in components and varying levels of prices. To say anything above $xxx is never worth it is stupid IMHO, and usually said by people who have little to no experience with those higher-end pieces.