I don't see anything inherently wrong in building a business around a civil service.

Your exclamation mark indicates that 30K is too much for an app like this, but I disagree because someone has to do the research to find each beach access point, identify false ones, organize the data into a database and build a app/web service around it.

For an average Silicon Valley salary, $30K is a quarter of a year's worth of salary. My guess is that more than three months of work was put into this.