Controlled risks, bah humbug! If you think Everest is a controlled risk, do not go there, you are severely underestimating the risks and you would die.
Depends on how much money you spend. It's still not easy, but if you're in decent shape, spend the proper time acclimatizing, go during good weather, and pay for a boatload of sherpas to handle everything and guide you and only you, you'll probably survive. If you're in a group or only have one or two, the resources might not (probably won't) exist for them to do much if it happens where they're going to be severely taxed themselves... But 4 or 5 sherpas spending 100% of their time focused on keeping you (and themselves) alive can probably do it, and I'd call it a fairly controlled risk.
Now, whether or not you've really accomplished anything if you've had a team of people babysitting you to the top is another thing altogether.
