Just looked at the BB wiki for the first time in a while: it has improved a lot! Great job!
These warehouse upgrades are ridiculous! Just completed the level 6 upgrade for 300k and was upset to learn that level 7 costs 600k for only 4 more slots. According to the wiki, it appears that after level 7 it is actually cheaper per slot to go ahead and save up 1.5M for a new warehouse. I know I'll probably need additional space someday, but for now, PASS.