Often prospective Hatteras owners will inquire about the cost of maintaining these beasts. I just finished some basic stuff and the cost is fresh. I changed the engine and transmission oil, engine zincs, and raw water impellers.
35 Gallons of 40wt appropriately rated oil. $630
4 engine filters, 2 transmission filters, 2 screens $200
6 engine zincs $150
2 impellers. $120
2 primary fuel filters $50
4 racor filters $60
Prop shaft packing (got some left for rudders) $100

So, a light service was about $1,300

Labor was free, and I bargain shop for case lot filters.