The keywords are "offered by most 401k plans". Within the universe of funds out there, it was utterly shocking to me how bad the funds offered in your typical 401k plan were. I honestly think they just stick random kids 3 years out of college to run them.
The solution is for employees to become better educated and demand better plans. This Frontline program does a pretty good job of getting the message out.
"Business" in general seems to be bimodal in making money from (a) providing value to sophisticated players, or (b) gouging the unsophisticated players (long tailing it) with a shitty product.
This is much of the consumer products/services industry these days. See, e.g., Applebee's.