Only if they needed the cash, or else the corporation would be a vehicle to store wealth.
Yeah maybe eventually. Though people try to find loopholes eg. move abroad, transfer the money offshore, lend the money to the consultant from the company rather than paying him or her, send the money to a company owned by an opaque offshore trust and so on. Big industries spring up to facilitate the avoidance that lobby politicians to allow the loopholes and so on. It can get kind of messy.
Literally everything you mentioned isn't a loophole, it's tax fraud. Tax loopholes are what they do within a single jurisdiction to avoid taxes. What you're suggesting is transferring money from one jurisdiction to another, which can't be done tax-free.
On example under UK law is if you work abroad for a year and deemed non UK tax resident then you could receive income tax free during that period. The K2 scheme that Jimmy Carr took part in got a lot of coverage https://en.wikipedia.org/wiki/K2_(tax_scheme)
Yep. Eventually. Meanwhile Buffett's tax rate on his (and his companies) income is within the distance of epsilon from zero. Can you estimate when Buffett is going to need the bulk of the money from his compankes to buy a new house? How long heis going to have approximately zero tax rate, that is? My personal estimate is with a very good approximation 'never'.
Buffet pays capital gains taxes and most economists who argue for dropping the corporate income tax only recommend so with an increase in income/cap gains taxes or even merging them.
As long as berkshire hathaway is paying capital gains on every investment, why would you care if the money stays invested in the company?