I tried to do some research on the Korean chicken as well and information that I found interesting is that the annual production is expected to be 686,000 metric tons broiler (= Chicken) and if the slaughter weight is 1.5 kg (conservative), this would mean an annual production of 455M chickens (app. 525M if the weight is 1,3kg). If the time from hatching to market is app. one month and if we assume that all are raised in hen houses, the montly production would be app. 38M chicken and with 25,000 chicken in one house, this would mean 1520 hen houses with 25,000 chicken all the time. As it rarely is like this in real life as I would assume that there is a period between chicken shifts for desinfections etc., and there are smaller as well as larger farms, I would assume that the figures are more like this:
Annual production of chicken: 500M
Effective time in henhouse: 8 months a year, i.e. 4 for desinfection, etc. (1 month effective + 14 days for preparing for new batch)
Average size of Hen house: 25,000 pcs.
Number of hen houses (if all produced in heated hen houses) = 500,000,000 / (8*25,000) = 2500
As this would be less than one house per farmer (3000), I would assume that either the average number of chicken per house is lower or the effective time is lower. But no matter what, I assume that a large part of the 3000 farmers are smaller producers (i.e. one smaller house with batches of maybe 5-15000 chicken), whereas a few may be larger (i.e. more houses with 25,000 or more chicken per house).
So my conclusion would be that it would be dangerous to multiply 70000 USD per farm with 3000 farmers. But for sure, a lower average figure, like 15,000 USD/farm, would also be very welcome ;)
Have a good trading day and a good weekend!