Exactly right. You remove the 10 worst or 30 worst days, your returns would be way above the 8.2% average. The point is, no one knows ahead of time which days

Exactly right. You remove the 10 worst or 30 worst days, your returns would be way above the 8.2% average. The point is, no one knows ahead of time which days will be one of the 10 best, and which will one of the 10 worst. Same thing with angel investors - you don't know which startups will be home runs and which ones will be strike outs. The data suggests you should play every day.