Always be happy with your system, otherwise you will spend all your time listening to its faults rather than listening to music.
Go to lots of concerts to remind yourself that home audio is only ever a poor substitute and not worth losing sleep over.
Just because something is cheap, it doesn’t mean it’s no good. Products may be cheap because they are brilliantly designed and efficiently manufactured, and expensive because of poor design, overpriced components and bespoke manufacturing.
Customers are usually right. Products that are popular are usually good. Products that are “rare” usually means no one bought them.
One of the best guides to how good a product is can be found as the ratio: used price / new price.
The best cabling is as little as possible.
Bass is over-rated.
HD audio is even more over-rated.
If you want to know if a new format (HD PCM, DSD, MQA, etc.) will have any traction beyond a few audiophiles, don’t ask an audiophile, ask the check-out person next time you are at a grocery store.
Component audio systems are just as much a lifestyle choice as single box systems.
Get your wife involved in big hifi decisions. She will never complain again. Getting her into the audio store was the tricky bit, it’s been plane sailing ever since.