PJT kindly asks, what do you mean by lower cost of living?
Consider, Cortecito is a compact community with plenty of basic amenities in a tourist zone. However, prices for these basic items, food, and services in this area is higher than the capital and there is less selection. If you desire a greater variety of commodites, need of services, and lower prices you go to Higuey some 45 kilometers distant. There is public transportation available but is more costly than in the capital. Having a car or moto available for your use is viewed by some as a necessary tool to survive in the zone. You are no more safe in the Cortecito than you are in the capital, there is crime.
A good attibute of the area there is electric power 24/7 provided by a private power company, CEPM. There is no having to deal with brownouts/blackouts and dubious billing practices. Line service is usually prompt in the event of interruptions.
It is recommended you visit the area for a week or two to experience the environment and then consider your desire.
Regards,
PJT