If it was 20 years ago and I had just got my driver's license and wanted to put some sounds in my ride, 2 things could have transpired.
1. Load up> multiple batteries, high power and big subs, brand names, loads of cash, only have the best of everything audio in my ride. Then I'd have used the gains as a volume level. Blow the amps and subs, and then watch from a short distance, as my new car burns and can smell the sweetness of the lead acid batteries as it permeates the air.
2. Learn something with cheap stuff.> Buy an electronics book from Radio Shack, and build my first bread board amplifier (only .75 watts BTW). Then buy $10 subs from a JC Whitney catalog and experiment with in different enclosures (with the cheapest scraps of wood too). And then let my new found appreciation for electronics blossom into respect and admiration for my new found friend, the electron. Over the years my confidence rises, and at a later point, I can finally be trusted with immaculately designed and engineered electronic equipment. Mufuckin Win.
You either buy audio equipment for attention, or for the appreciation for the physics and engineering involved in it's correct utilization. And the 15 year old asshole kid that threw $20,000 of money at a system with his parent's money, has no appreciation for audio, only an affliction with attention.