I'm not the first person to think it's absurd to stick a piece of tape on a $2000+ machine that is valued for its asthetic appeal. Remember how apoplectic people here got when it was suggested that an Intel Mac might have an "Intel Inside" sticker on it? Besides, putting tape over the lens doesn't solve the security issue. You can put your cameraphone in a lead box, but if there's a "no camera" policy anywhere, they won't let you take it in. They sure as hell won't let you take in a laptop with a camera, even if it's swaddled in tape.
Surely Apple knows this? I mean, I'm quite sure they have a "no camera" policy in their own product labs. Why would they make a "professional" product that can't be brought into design labs, architectural firms, biotech companies, and the like? They really should offer a model with no iSight.
And as for not using the computer in the nude, that smacks of the "if you've got nothing to hide, why hide it?" argument. Why not let the government (or your neighbor) read your mail or wiretap your phone? You've got nothing to hide, right? So you wouldn't mind if I set up a webcam in your house?