Poor or not, the witlesses are too stingy to build better buildings. And by better, I am not referring to crosses and statues (though, until recently they used their trademark symbol in lieu of a cross) which do cost a lot of money.
But, Kingdumb Hells are generally pieces of crap. They throw up a building in three days (plus 2-6 months for site preparation) to give the illusion of having God's spirit when in fact it is crap workmanship. Notably, given the tools, I could easily put a pre-fabricated structure up that is as simple as a Kingdumb Hell in a couple of hours, as a pre-teenager. Getting the quality takes longer, which busts the myth that they have any special spirit.
Quality materials also cost more money (Worldwide Pedophile Defense Fund money). I have noticed that every single Kingdumb Hell I have ever had the displeasure of going to has had crap climate control systems. The air conditioning always seemed to conk out several times a year. The last regular boasting session I attempted to go to had to be cancelled because the heat in the back room conked out, which it has had a history of doing. They have crappy temperature controls (or people that do not know how to set a thermostat). Many lack windows, though that is just as much to prevent distractions as to cut costs. The flooring under the carpet is particle board (which outgasses formaldehyde, and without ventilation, that is going to lead to many a headache or worse). Things may look reasonable on the outside, but I have seen more problems with the alarm system, doors, HVAC systems, lighting, and electrical systems in Kingdumb Hells than is expected at any worldly building.
Perhaps when they have a fire because the electrical system is not up to the task, they will realize that better electrical systems are cheaper than fires. As for the p*** poor air conditioning, getting a $2,000 electricity bill because the air conditioning goes on the fritz will be more expensive than just getting the higher grade unit in the first place. If they get burgled, it might well be more expensive than putting in a decent alarm system that is not prone to conking out on them. Or, maybe they just love to throw away their money (or beat up on people to donate even more when those higher bills start coming in).