What is your occupation?
If you're working in a strenuously active type of field, 3000 calories might be perfectly reasonable. Someone in the building trades, for example, would need more calories than an investment banker to get him through the day. That said, if the investment banker is otherwise very physically active outside of working hours - 3000 might be good for him, too.
Your height, weight, muscularity, usual activity level - all come into play when educated (I liked that you used that word) calorie level recommendations are made.