First, the issue is that you'd need to compare free healthcare in "Europe" (it varies quite a bit both in how free to how good, but ok), to what you can get on a $500k salary in the US. You don't compare the situation described, but something different.

Second, most developers don't run an independent ISV with their spouse ... If you did this in the US you'd have to further compare: $200k in .eu with healthcare with, say, $500k plus double that in business income, or $1.5m per year.

I think healthcare is going to be FAR better for you in the US. This won't be true for everyone, maybe won't even be true for most, but for you there can be little doubt.