Hi Lauren,
There's a lot going on here. It helps if you first define your focus and goals for giving allowance, having chores, teaching money skills, and motivational rewards.
The way I look at chores will probably differ from the mainstream. I do not pay my children for doing what I expect them to do as a family member. Basically, I don't want to reward them for what is already expected. For my children, making their beds at the age of 8 is expected. Helping with dishes, cleaning the bathroom, picking up their belongings, etc... are expected. I don't expect an 8 year old to mow the lawn. But, I wouldn't pay them to do it as an extra chore either.
As for giving money or prizes as a reward for grades or reading. I don't think I ever have. It was always expected they do their best. If I felt they needed extra reading or an additional challenge, I tried to provide it by letting them choose the books to read or reading difficult books with them. Generally, I've always tried to steer clear of giving prizes, food or money for expected behavior. I figured the natural rewards were sufficient and fulfilling, such as: pride in one's work, the feeling of accomplishment, a boost to their self confidence, building up of their character, etc...
Personally, I don't do allowance either. I've come to the conclusion that my children can learn about money handling skills by other means. That's not to say that allowance doesn't teach money handling skills. It's just that my children haven't needed a weekly allowance to learn how to save, spend, and give money.
If the finances are available, I will give them money for extra-curricular activities. If they want an expensive item, we may buy it for them or they may save money for it.
They receive money from holidays and birthdays. They earn money from working in the neighborhood: shoveling snow, doing extra work around the house, mowing the grass, babysitting, painting houses, clipping hedges, etc... I understand that my children were older than 8 when they earned their own money. But, there wasn't a real need for them to have extra money at 8 as they don't have any bills to pay. I figured there was plenty of time for them to learn money management skills with what they earned as teenagers from part time jobs.
Normally, we give as a family. We discuss what we will give together. My children have given time as well as money to church and various charities. When they give individually, it's usually something they've made or can give without costing a penny. My favorite gift is a back rub! Sometimes, they will forgo going to the movies with friends in order to buy a present.
I guess I sound stingy. Really, it's not like that in my home. If I did give allowance, it would be with the goal of teaching money management skills. I would calculate how much I spend on them excluding food and lodging. They would use their allowance to spend on soap, toothpaste, hair care products, clothes, etc...
I try not to nag either. It's difficult building good character traits. I guess that's what life is about. Trying to do what is right for righteousness sake.
Blessings on your journey.
Wendy