Experience is important in correctly performing a task, so when electronic voting machine manufacturers are looking for employees, people that have worked with elections are a good choice for them. Former election officials are among these people, and are in a good position to advise on voting machine manufacture and improve the product.
Why are we drawing the line at electronic voting machines? We already have wars started because of people's affiliations with defense contractors, tons of security in airports because of political connections (including x-ray machines supplied by the company of the man appointed to testify in Congress about why we need x-ray machines), so why not just let the voting machine guys in on it also? :/