Startups don't forgo health insurance because it's expensive, they forgo it because purchasing health insurance is a gigantic, time-consuming pain in the ass.
The BLS lists benefits as roughly 30% of total compensation[1]. Much of that goes to healthcare.
So for a developer earning $100k in total compensation (say $70k salary, $30k benefits), healthcare costs for that one employee might be $25k+. Providing a good policy for employees (and their families) is expensive. Worth it to care for the team, but still expensive.
To the people skipping coverage in the US: it's stupid and not worth the risk. You may be healthy, but you cannot control everything that impacts your health. Infectous disease happens. Car crashes happen. Skipping coverage is playing Russian roulette.
That said, I'm young and am fortunate to still be covered under the policy of my parents. Perhaps the college years and shortly after are best for trying a startup--while family coverage is still in effect. Then, or after you're married to someone and are under his or her policy.
