They just don't make sense for (small investors). They'll get eaten up by the commissions.

Seemeth it a small thing unto you to have eaten up the good pasture, but ye must tread down with your feet the residue of your pastures? and to have drunk of the deep waters, but ye must foul the residue with your feet? / And as for my flock, they eat that which ye have trodden with your feet; and they drink that which ye have fouled with your feet.

Romantics consider common sense vulgar.

A sense of blessedness comes from a change of heart, not from more blessings.

Those subtle differences (in returns of index funds) make a big difference over the long term.

I think there is an increasing recognition at Fidelity that fund size can really harm performance. If they are too big it can be pretty tough to reposition a portfolio. That is something Fidelity didn't acknowledge a few years ago.