I don't think Norway ends up more expensive than SF or Manhattan for most people. Yes, petty expenses like buying beer in a pub are high, but the really big expense for most people, rent, is far lower. You can get a nice, modern, centrally located apartment in Oslo, without roommates or rats, for $1300-1500/mo ($10-12k NOK). And you can get it down to more like $1000/mo ($8k NOK) if you're willing to commute a bit. Try getting something with that budget in SF or Manhattan!

Taxes are high, but for entrepreneurs that's largely offset by: 1) no self-employment payroll taxes, and 2) your taxes cover your full health insurance costs. Once you add in the U.S.'s 15% payroll tax and health-insurance premiums you don't really save much in many scenarios.