The slight edge, ever read that book, taught me something.
A penny saved is a penny gained. With money i realized the rich are those who understood the power of compound interest, it's amzing how we sometimes forget about it.

It's important to realize that the effect of small amounts is even more important in your finances due to the ability of money to compound when invested

Absolutely, just as you said, the money we spend on usual things that aint so useful too compounds up, we realize after a year that we wasted a little too much dollars in things that don't really matter.
Just like a business, we tend to undermine it's beginnings, it's until we build it up after a long time that we look back and be glad we persisted with discipline.

So the peanut butter sandwich saved you alot, it seemed insignificant until it happened over and over for some time.
This is a nice one, loved it.