My understanding - which may be wrong - was that long-life bulbs used more electricity to operate and that the efficiency gains of a 1,000/hr bulb reduced the overall cost.
So, making up numbers, a 2,500 hour bulb may cost $5 to replace and would incur $20 of electricical charges for a total cost of $25 or 1 Cent/hr. Meanwhile, 1,000 hour bulbs would cost $10 ($4 * 2.5) while incurring $10 of electrical charges for a cost $20 or 0.8 Cent/hr... even factoring in the cost of having to replace the bulbs.