@sfergus - Years spent building up the bonus % and buying and then selling high-value items just for the XP points. For a good start buy KEMs and sell them after they finish building. Best return for your cash but it takes 4 hours for them to build so you can collect the rewards and start another load.
Get your bonus up to over 1000% - it'll take about a year from starting a game without spending real money and best for the $$s is Burns Boxes in store. You can get through a 7 box cycle with 32 Donuts because it'll give you at least 10 sprinkles in one of the 7 boxes and at least 1% up to 3% bonus every time. By the time you've done that you could be looking at 100 donuts a week at least. Keep adding to the bonus and your cash and soon you'll be buying a heap of trucks and getting 100 donuts in under 5 minutes.
ADDED :-
I won't know until I strip it back and see, but I reckon my town is big enough that with 1,900% and the collider off ( = 300% with the collider on ) I should get 15 Ds a day / 105 a week.
It might even need less bonus than that, but it'll cover the cost of the new premium stuff for the events if they stick to this current format and frequency. Get a busy event or a lot of returning items I want then I can just pop the collider back on and maybe farm a few trucks
