St. Marys, Georgia is a small town with a population of around 18,000 people. Here are some advantages and disadvantages of purchasing real estate in the city:

Advantages:
1. Affordable real estate: Compared to other parts of Georgia, the cost of real estate in St. Marys is relatively low, allowing you to get more value for your money.
2. Beautiful location: St. Marys is located near the coast and has access to a number of beaches and outdoor recreational opportunities, making it a great place to live if you enjoy spending time outdoors.
3. Small town feel: Living in a small town like St Marys provides a sense of community, simpler way of life and close proximity to schools and parks.

Disadvantages:
1. Limited job opportunities: The job market in St. Marys is relatively small, with few large employers, which could make it difficult to find work in certain fields.
2. Natural Disasters: St. Marys is also at risk for hurricanes and flooding, which could affect property values and could potentially be a long-term hazard.
3. Limited entertainment options: St Marys is a small town and thus it may be more limited in terms of entertainment options like cinemas, nightclubs, and other social spaces.

As with any location, there are advantages and disadvantages. It really depends on your individual circumstances and what you are looking for in a place to live.