Mathematically, if you save $100 per week for a year, it equates to roughly $5,000 per annum.
So 10 years equates to 50,000
But in order to save $100 per week on food, means you need to be saving at least 20% approx. on regular supermarkets apart from Aldi.
So that gives me the impression, you could be spending a lot on food per week if say 20% is equivalent to $100 savings.
That makes it something like $500 food spent a week
And not forgetting, it's a bit like "I go into Aldi for some bread, and end up coming home with a 2 man tent, a chainsaw and a trumpet"
I think you may mean you save $20 per week against the regular supermarkets vs Aldi?
That's more like $1000 per annum
Hence, 10 years = $10,000 savings.
And yes, it does all add up, saving money here and there over the long term.
But the way life is designed, we try to save and cut back in ways, that rates, registrations, insurances take away from us more than we try to save.