I don't get why. Counting ballots is so easy. Fraud can easily be prevented (open process that everyone can attend, group of people who have to agree on the result, re-counting by officials of results that are outliers and of some random samples, etc). Plus it's cheap. I find it hard to belief that these systems can be cheaper than a few people working for $10/hr. Counting a few thousand votes can easily be done in 2-3 hours by 3 people (by my own experience).