Hey, so I hopped straight in, spent a whole bunch of img on upgrades... and they don't seem to have any effect.
I got several quoin multipliers, two 50% and a 100%, but grabbing energy quoins in pansanu insanu only gave me 11 energy? Surely it should be more than that? I also got the rube upgrade that stops him from offering me low priced items, and most of the offers were for single herb seeds or single herb plants? The only higher offer was a spice mill as offer 5.
Hope this helps!