JFC...I helped lead an AoA for an aircraft/capability a few years ago and folks who didn't know much more about planes were enamored with UAV's but the size, weight, complexity and capability made a larger manned aircraft the only real 'alternative'. UAV's weren't even in the same ballpark, wiffle ball vs MLB.
That chart does little to really go into any detail whatsoever on the significant differences in capabilities between the E-2, E-3 and E-7. Any actual analysis of the three would highlight those different capabilities and even with the increased cost of the platform I can guarantee the E-7 would come out far ahead of the E-2D.