Cost does matter, It is much cheaper to use wood and I guess if that area has plentiful of cheap wood. Provided one could control the micro enviroment otherwise everything goes up-side-down. These kind of wood farms are plenty in Thailand and Indonesia, and I have seen few in the East Coast. In these areas birds are conditioned to wood farms so if you build another wood farm here I think it shouldn't be any problem to suceed.
It would be a major disaster if the whole areas are with building of shop lot (cement&Bricks) and you start one like this. Its quite windy inside this wood farms where the air could be draw in and out from the gaps between the walls that are made of planks. The presure of air has to be very precise to control the RH & Temp. So I always believe if one could start a wood farm with few hundreds nests in it they are dam good in controling the RH & Temp and I respect them. Believe me all these guys don't use all those gadgets such as Hygrostat which automatic control the water mist. This is wood farm if the mist machine is fixed the whole farm will be full of fungus as it is 100% wood. Even the flooring is wood. Obviously no Mist maker and water pump.
So seeing is believing so aren't we lucky to have those gadgets? Or our knowledge is lack? Or we have been spoilt or influced by electronic gadgets. These farm owners truly have a good in-dept knowledge of what I call micro conditioning adaptation technique (MCAT).
Given the situation in Malaysia, well I guess its better to buy the gadgets and solve the problem instantly rather than to crack your head to think about what the reason that actually affect the Micro conditions. Malaysia Boleh!