If you learn anything in this hobby it's don't make the same mistake twice. You can choose two paths
1) Buy a used system for $300-$600 and spend $1000 a year trying to make it look like Torqued's tank only to find out that your used tank is grimey and it will never be good as his and waste a year or 4 - so you start over at number 2
2) Read everything first, find a friend who knows the hobby, have the world highest patience and spend $2000 on a custom build and think you have a budget set only to find out that you need more of something you haven't consider before only to spend more money.
3) Spend 10 times as much on a dog or cat from purchase, food, toys, treats, medicine, clothes, vet bills, boarding, grooming, etc.
4) Worry too much about money with no hobby and be a boring joe and constantly wonder what it would be like in someone elses shoes.
There are many lessons learned in the saltwater tank hobby.
1) Woodworking and Building/DIY
2) Electricity
3) Complex Chemistry
4) Speciation
5) Patience
6) Feeling of Accomplishment
7) Budgeting
Overall I would say that it test your ability to accept yourself. Are you satisfied with your build, your tank, or do you constantly look at another person's setup/lifestyle? Can you build the best with what you can and be happy. Understand that you may not be in a position to spend $5,000-$8,000 on a dream tank, and you will lose your behind in cash if you try and keep up at a pace that you can't keep. When you can look at a $5,000 tank that a company came and installed in the wall, appreciate it, but know that it's trash compared to the reward you feel from the blood, sweat, spills, and the overall knowledge and experience acquired. Then, you can truly call yourself a hobbyist and possibly a man.
I relate it to human nature and it's ability to have an unfullfillable satisfaction. You don't need an apex controller, you don't need radions, you don't need that $150 frag, you don't need a gem tang, you don't need to use up an entire bedroom or garage for your sump, and you don't need to compare yourself to the elite who took it way too serious. I would say that one is lousy if this is what their paycheck goes to, but hey if it makes you happy, do it!
Things to take in:
Do it if it makes you happy or feel accomplished.
Do it if you can afford it.
Dogs and cats actually cost more over their lifetime so there's that.
It is beautiful to watch and relaxing.
Saltwater is better than freshwater.
Life is short and if you want that fish tank, you buy that fish tank....
but only if it's in your budget