Insurance companies are among the most profitable businesses in the world. They profit from the spread between premiums collected and claims paid — the "combined ratio." If a company collects $100M in premiums and pays $95M in claims and expenses, it earns $5M in underwriting profit. Plus, it invests the premium float (money held between collection and claims payment) for additional returns.

This is not inherently wrong — insurance provides real value by pooling risk across large populations. But it means the house always wins on average. For any individual, insurance is a bet that you'll need more than you pay. The insurance company is betting the opposite — and they have actuarial tables, data scientists, and centuries of probability mathematics on their side.

When to buy insurance: when the potential loss would be financially catastrophic (health insurance, homeowner's, liability). The purpose of insurance is protecting against ruin, not smoothing every expense.

When to skip insurance: when you can absorb the loss from savings. Extended warranties, phone insurance, rental car insurance through the rental company, low-deductible plans with high premiums — these are profit centers for the seller. If you can afford to replace the item or cover the deductible, you're usually better off self-insuring.

Insurance policies are contracts — and the contract is written by the insurance company's lawyers. Key terms that limit your coverage:

Exclusions: specific situations not covered. Homeowner's policies typically exclude: flood, earthquake, mold, "acts of God," and wear-and-tear. Health policies exclude: experimental treatments, pre-existing conditions (with some ACA protections), out-of-network providers, and non-formulary drugs.

Deductibles and co-insurance: you pay the first $X (deductible) and then a percentage of the rest (co-insurance) up to your out-of-pocket maximum. A plan with a $5,000 deductible and 80/20 co-insurance means you pay the first $5,000 plus 20% of costs above that until hitting the OOP max.

Claim denial patterns: insurance companies have financial incentives to deny claims. Common tactics: requiring pre-authorization for procedures (creating denial opportunities for paperwork failures), classifying treatments as "experimental" or "not medically necessary," applying "usual and customary" rate limits that are below actual provider charges, and processing delays that discourage follow-through.

The defense: read your policy BEFORE you need it. Know your exclusions. Document everything. Appeal every denial (studies show 50-60% of denied claims are overturned on appeal — companies count on you not appealing). Consider the deductible as the real cost of insurance: premium + likely deductible spending = your actual annual cost.