What is your biggest regret (purchase or non-purchase)?

Mine is also the Krusty Terminal as I'd misread spoilers and thought the first terminal was free, then the mall and tetanus terminals would be premium too. However, if I get around to redesigning, it will be good to have a terminal in each corner I guess.

I also regret not spending donuts (to compensate for not enough crafting) to get the donut torture device last Halloween. It would've only been 50 or so.