They still are expensive, certainly, but even at $40 they will still pay for themselves in a relatively short time. You save 48 watts of electricity, you save on A/C costs and best of all, you save from having go up a ladder every 1000 hours to replace the bulb. An incandescent bulb on Amazon goes for at least a buck, so during the life of this bulb, you would need $25 in bulbs alone.
CFL aren't the answer either. They need to "warm up" when cold, and from my experience, they don't last anywhere near as long as they should. I have 25 can lights, and was replacing one at least once a month. With 12 ft. ceilings, its not something I miss since going to LED.
There is over 150,000 emergency room visits in the US each year, over half from those changing light bulbs.