You know, formula doesn't grow on trees and breast milk isn't cheap either.
LOL! Good joke!
My children, including my 5year old do chores as expected of them. Their major jobs are to keep their individual rooms clean, i.e., spread the bed, put dirty sheets in the wash (not the younger one), pick up after themselves, make sure their laundry goes into the laundry room for washing, my oldest does her own. My oldest cleans the bathroom they use and she has certain days to wash dishes or use the dishwasher. My son just started doing dishes - he complains. He doesn't clean the bathroom because of his asthma. I have told him though that he will start cleaning the toilet since he's so messy when he uses it (his sisters complain)! He's learning to aim more carefully!lol!
I do give them allowance, unless I have to buy something that they really want, then that supercedes getting an allowance. My daughter was working and didn't need an allowance, but when she quit that job she was back on the payroll! She's working again now!
Kids can be lazy in that they don't want to do the simplest things or you have to remind them. So if they want to hang with friends, or go to a friend's house or something else, they know they won't be allowed until their chores are done.
I pay them for anything they don't usually have to do, like babysitting their younger sister.