Yes, but there are only X number of people living in NQY's catchment area and there are only X number of hotels, guest houses and/or static caravan parks within NQY's catchment area also.
So ..... whilst airport traffic may slowly increase, and unless Cornwall becomes, literally, wall to wall hotels, guest houses and/or caravan parks, the airport traffic shall NEVER attain a level to justify the size of the airfield real estate and/or the paying of market salaries.
The airport is always likely to remain subsidised by taxpayers thus the higher the salaries then the more monies taken from the local economy!