The reason Walmart can charge such low prices (and yes, I do shop there) is that the store reached “critical mass” many many years ago. The reason supermarkets offer “buy one, get one free” is because their suppliers reached “critical mass” many years ago. A more common term for this is known as reaching “economies of scale”.
This may or may not shock you, but investment firms / investment funds and banks also reach these critical mass levels and economies of scale. Unfortunately for investors and consumers, they’re not passing on their ability to lower their fees as much as they could. I've never seen advertising that says : Buy one investment product, get a second one FREE...

Investing for less should be a priority for all clientele and consumers, but most people fail to compare prices / or fees because it just isn’t as easy as walking down an aisle with a shopping trolley.
Personally I believe that it should be, and there should be a common ground where clients or investors can openly go to perform such a task.

Invest for less. Negotiate lower fees with your Investment Advisors. Compare fees their fees and obviously the service they provide. Use the words “critical mass”. It will work.