Most people don't have ongoing location discovery needs that would cause them to consistently engage with location based apps and services. People find the things that are compelling to them and then they tend to move on. People who live in cities, often the prime target for LBS, are often well aware of lots of great things to do around them.

Prime candidates for ongoing engagement with LBS are: people who travel a lot, people who are hungry for new and interesting stuff but don't know where it is , and people who are new to city (even here engagement will be limited).