@interfluidity Isn't that mainly a thing of practicality?
Since you cannot determine who cast the vote as long as anonymity is given, you'd have to give up anonymity to do this. I'd say that would be an unacceptable price.
@interfluidity Ah, that makes sense.
In that case, i guess it comes down to comparing the effort to the expected gain in precision. Compared to people with for example dementia voting or intentional voter fraud, of course. Can't say what i think without comparison :-)