For many brick and mortar businesses Tripadvisor reviews are very important to generate customer traffic and increase credibility.
The biggest reason that would make me buy LaMetric would be if it could count the number of reviews and 5 star reviews of my business so customer can check it and review it as well while they are there.
It is the same as the Facebook Fan counter but for Tripadvisor.
I hope this comes to be developed soon so I can purchase my LaMetric. For now I'll continue with the manual Tripadvisor counters :/