Manston just doesn't have the catchment area to succeed - the nearest town of any size is Maidstone and that is almost as close to LGW as Manston
The area around Manston isn't exactly booming economically and so you aren't going to get the business traffic
Cargo?? Only if you pay them to come..........
When airports such as Leeds are suffering you can see you need a lot of punters to be attractive