In Regard to Housing in Patch 4.1

[worldofneil]

After you spend 5M growing 10 onions, you'll realize why they cost 220k on the MB.

They cost so much on the market board because they're a pain in the neck to make (If you don't buy the seeds that is) and if you did you just cut into your profits to save time. You have to crossbreed two seeds to get one type seed (5 days), crossbreed two other seeds to get another type of seed (3 days), crossbreed those new seeds you got together to make onion seeds (5-6 days) and then assuming you actually got some onion seeds (not guaranteed) it's another 10 days to actually grow those into a working onion.

Multiple plots required to make it effective so you can have all 4 stages going at once or it's incredibly slow going.