I have a friend who is. He's very good at his trade and does contract work (think electrician type thing) but he works abroad, £500 a day, no tax, he's always away though, will work his arse off and his employers love him for it, he'll fly all over the world, work to fit out buildings, so much so he now employs people to do the same, but he pays them whilst he invoices the customer.
He's younger than me but looks wrecked! He's constantly knackered, always ill, never at home, lives in the worst conditions sometimes, to me it's just not worth it. He'll probably retire and implode