Do you have such rough roads where you live,
Yes i do, and i spend good time finding them, but i match my speed to the road conditions. I would rather travel more slowly, yet do it in more comfort using lower tyre pressures.
Sorry, but I'm not understanding this
I prefer comfort to a rough ride. My preference is for the tyre to partially soak up the bumps. Unfortunately my bike frame only allows a max tyre width of 2.25". I would prefer to have proper balloon tyres in a modified GT LTS frame. That would be the ultimate in comfort, but the lions share of engine power would be used to overcome rolling resistance. That said, rolling resistance doesn't worry me, because speed is not my goal.
you would have a greater benefit in the area of comfort from an appropriate seat and/or suspension seatpost combo
My bike is installed with a super comfy gel-seat and the best suspension seat post on the market; fitted with the softest and most comfy long travel elastomer available:
Cane Creek Thudbuster
they ride much smoother than the knobby tires I used to run
I need tyres with an off-road pattern because i spend a lot of my time riding off-road.
The lower tyre pressures assist with traction, especially when negotiating your way down hills on semi rocky surfaces. The tyre much better wraps itself around surface protrusions, giving more slow speed control when hard on the brakes on nasty (off-road) inclines.
with that low tire pressure, your tires must not last very long at all
Typically i get 3,000 kilometers (1,860 miles) out of a front tyre and 1,500 kilometers (930 miles) out of a rear tyre, and that's due to the tyre tread surface wearing out.
For the most part, wire bead problems aren't an issue, though this is the second tyre (in the many fitted to my bike) that's had a bead failure. Overall, it's not a bad number, however, you have no external indication that the wire bead is starting to fail from an outward inspection of the tyre.
Inflating your tires that low can have no possible advantage
Primarily advantage = comfort. 24 PSI is the lowest pressure i can go for my weight.
I will agree that low pressures greatly accelerate fatigue and premature failure of the wire bead. Having said that (and for the most part), the tyre tread wears out before the bead fails.