Charleston's revenue collection was a fraction of what was collected in the Northern ports as given in the reports of 1854...
New York- $13,767,000
New Orleans- $555,000
St. Louis- $260,000
Those extra troops in 1850-52 caused otherwise loyal Americans to distrust the Federal Government even more. Especially after interrupting Charlestons June 28th celebrations by blocking access to Fort Moultrie. Armed troops blocking access to city officials to harbor assets at Fort Sumter. Extra crime, etc.