Where I live, the paper ballots are collected, moved and counted by volunteers (in big open halls and other public spaces where anyone can go along and watch). So I guess cost doesn't have to be an issue.

Voter turnout: People prefer screens to paper or something? Sounds odd that voter turnout would be affected by the exact method of voting.

I honesty don't see how electronic voting machines would increase voter turnout. How would there be a (significant) cause/effect there?