Spending money on fireworks are the same people who buy lots of scripts at the 50th state fair and on welfare/live housing. I went to Kaimuki and grew up with many who lived in the Palolo housing. I would run into them and their families at the fair and they got $600 worth of scripts. While I only was able to afford $50. They also did the same with fireworks. It could just be a Palolo thing maybe so correlation =/= causation as 1 might say.
I have a friend who is going mortgage broke. He and his wife spend all their money on their $700K townhouse in Kapolei plus maintenance fee of $300 on top the mortgage of $5800. They cannot afford to travel or buy random nice things. They aren't eating cup noodle every night, but they def can't eat out very often and have to cook. If their car breaks down and they need to fix it, they're screwed.
One thing to keep in mind is, if together they are paying $6100/mon in mortgage+fees, then it's basically a cash flow situation. They can set priorities, put some money away in retirement and savings (most 401K plans allow pre-tax contributions and company matching funds, so you avoid income tax being taken for that amount), and so on. When they file for taxes, if they have a high enough joint income, then they can usually deduct the interest paid each year from their taxable income resulting in a pretty big IRS and State refund or a reduction in taxes they still owe.
Many don't think about the tax benefits of homeownership. Taking the mortgage deduction effectively reduces monthly payments by 1/12th of the tax savings amount. You just don't always get the savings until the following tax filing season but it comes out in the wash. I received at least $10,000 in additional tax deductions for mortgage interest, so that's effectively an $834/month reduction in my $3,100 monthly mortgage cost. I had rental income that usually covered that home's mortgage, so if I had enough interest payments, depreciation and other expenses, i could usually offset that income to where i owed no taxes on it.
Of course, the flip side is you have to have savings (or equity?) to pay for major repair or renovation costs that pop up, too. My 401K allowed me to borrow from my investments without penalty or taxes and at a lower interest rate (which I paid to myself) if the money is withdrawn for home repairs or improvements.