The way i look at it is.... #1 is condition of the boat and motor. You can tell if something has been used and abused. It could have a 5000 hrs on it, but the boat has been well Maintained.
If you break down the 496 hrs, 11 yrs old......45.09 hrs per yr......Here in southwest ohio we normally get a solid 4 months per yr of boating time. Most boaters only boat the weekends. So thats 16 day's per 8 weekends....So thats 2.81 hrs per day. Looks like it wasnt used all that much.
Most of the hrs on your chart indicate...Idle time and alot of no wake zones.