It really depends on the person, his flaws, and the role.
Roger the Coke Fiend actually seems like he'd be manageable as a part-timer: keep him on the bench, and if you have a cool 72h burst for him to do, especially if the consequences of his failure are not bad in any case. A dull but productive and reliable guy makes a great accountant. It's all about the specifics.
For someone unethical, I'd be reluctant to do most business, but might be willing to do arms length product purchases. For instance, there are musicians who produce music I sometimes enjoy but wouldn't trust at all.
Definitely. I think at the end of the day, Id still be wary of lack of ethics (or professionalism) regardless of an uber IQ (or HQ - Hackability Quotient!). While there may be a lot of value from this person, the costs of managing would certainly be high as well (from the point of view of ensuring there are no negative effects - both tangible and on team morale)...
Roger the Coke Fiend actually seems like he'd be manageable as a part-timer: keep him on the bench, and if you have a cool 72h burst for him to do, especially if the consequences of his failure are not bad in any case. A dull but productive and reliable guy makes a great accountant. It's all about the specifics.
For someone unethical, I'd be reluctant to do most business, but might be willing to do arms length product purchases. For instance, there are musicians who produce music I sometimes enjoy but wouldn't trust at all.