Personal budget is the key and only a fool would disagree.
Remember, to live a middle-income lifestyle relative to $50-$70,000 today, a 35-40 year old will need approximately $1.4 - $2 million at retirement (most of us won't see social security). If you are investing at the proper rate, keeping your income to debt ratio level, saving for emergencies (at least 3 - 4 months rent or mortgage in savings), budgeting for all living expenses and saving for "other pleasures", like a much needed vacation, then you should spend what you feel comfortable with on audio components. If you are the provider for children, then you should NEVER eat into THEIR living expenses (education, medical, clothing, TOYS, etc) for your toys (that would be @#$% SELFISH and worthy of being broken and injured by Tony and the boys)
My point; don't let this hobby ("obsession") get out of control. Audio equipment depreciates as fast as your automobile. Make darn certain that you are investing in more tangibles and intangibles that appreciate than the ones that depreciate (i.e. house, real estate, investments, etc.) We all want what we can't have. $16,000 power amps just ain't made for some of us (not to mention $5,000 cables and ICs). Be happy with what you have. Then have a cocktail!!!!!
Kind of a no-brainer. Don't ya think!