[Hellcat]

You verify the votes to ensure that the system is working correctly, Wombat allows voters who suspect that the machine is not work correctly to audit, but it is not necessary for voters to verify. It is sufficient that supervisors do so occasionally and that having inspectors randomly audit about 1-2% of the ballots is very reasonable.

[Groxx]

Because supervisors are never suspect. It's not the machines people worry about, it's the people programming and tending the machines. So to catch a supervisor, you'd need 1-2% of voters to audit the machine... which I find extremely unlikely to ever occur.

[Hellcat]

you seems to be confused about the role of a supervisor. It is the supervisor that is supposed to make sure that the programmers and tenders did not do something improper.