Well you didn't say there was competition.
What will happen in a competitive situation where you're both equal is that you'll both take half the paxes (or a third of the pax, etc.).
If you have more frequency, you'll do better.
The issue with a 3,000-mile route is that you can't do it several times a day. Frequency trumps any additional revenue on a per-flight basis (if only because you do it twice, doubling your profit).
I always focus on close-in cities before I tackle the outliers and I always try to find the sweet spot of the particular plane (attempting to keep flights under 2 hours or so, etc.) Margins on close flights are higher.