[thtthings]

What i think he is saying is this:

If you look at s&p 500 stocks weight for instance, at number 483 is Rollins inc, weight 0.019938%. Do you know this company? But everyone here if you have invested in s&p 500 has invested in this stocks. The way s&p 500 works is it picks stocks based on market cap. Now this company has a very low chance of getting kicked out even if it is a dud as people keep investing in it via ETF's

Here lies the opportunity. If you go through every company in s&p 500 you are going to find overvalued and undervalued stocks. One strategy is to pair trade. Take a long/short position. But it is very tough to time as every keeps investing every month. Other strategy is wait for a crash and instead of again investing in these ETF's for small returns pick stocks that got battered for no reason. This has inspired me to actually work a bit, actually looks at balance sheets and pick stocks.

Side note, i only own one etf and it is PTF. It has very little stocks and i think focused funds are a better bet.