I wish I had saved my wish for when I had something like 5mil lollipops.
Did you know you can keep clicking on the merchant's lollipop to make the price lower? And on his hat for free candy?
I wasn't going to click these because it seems too obvious for it to not be a joke, but then I got curious, because sometimes the person is telling the truth, but all that happens is that the merchant seems to get angry.
Hm. You have to click about 15 times on the round part of the lollipop next to the merchant, I think. He first tells you to stop it because other people might want to buy it, then he starts lowering the price and then at 50 candies he says he can't go any lower. As for his hat...I don't know why it didn't work, you only have to do it 3 or four times, IIRC.
EDIT: Also, when you get the cauldron (from the castle stairs - summon an IMP as soon an you star the quest), make some GMOOH potions. Each one has a chance to send you to a cow level which on completion will triple your lollipop harvest (you can still only have 100/sec from the farm, but you will get 300/sec in practice)