My understanding is there is no fee when putting in money towards your Vanguard Index Fund. I don't think they charge any extra money per transaction. You probably get screwed a little based on how quickly prices update and what price you pay per share (I don't know if you do but I'm just guessing). However, as people who don't have a day job in buying and selling financial instruments, I think we are probably better off buying and holding. And hoping and praying the US economy and the world economy will overall grow in the next fifty or so years.

https://personal.vanguard.com/us/whatweoffer/stocksbondscds/...