I bought almost all the upgrades there are and nothing bad has happened to me exept I don't feel like i'm getting credit for golden cookies....
You will get some RED cookies instead of golden cookies which can destroy some of your cookies. And the new background will cause nightmares.
I think I got just got really ADDICTED But on the plus side i GOT 446,189,318,305 COOKIES AND COUNTING!
My dream is to get a army of old grandmas. WE WILL DESTROY THE WORLD WITH OUR COOKIES!!!! HAHAHAHAHAH!!!(Evil laugh)
50 AC in one day and i had it closed for 75% on my on time im up to 848,682,214 at this time and ill be logging for bed no and leaving it open all night ill post result in the morning