So question: do golden cookie effects stack? Before the Get Lucky upgrade this was never relevant, but can I get 2 golden cookie effects at once? For example, 7x cookie production for 154 seconds and the +10% or 20 minutes worth of production (whichever is lower)? Right now the 10% bonus gives me 1.2 trillion cookies, so if I can stack them together, the 7x modifier would allow me to get 8.4 trillion cookies as long as I had 84 trillion cookies on hand.
I only ask because dropping 77.7 trillion cookies for an upgrade is a bit much and if I'm going to buy anything right now, it'll be those 10 upgrades that give +15% production each and cost 100 trillon a pop.