Past performance.
I’m my experience people that are busy saying that the market gives less, don't invest at all.
Should I share with you my investment accounts?
With all due respect, how long is your experience? Were you invested in the market in 2008? in 1999? in 1987?
Let's go back to the questions I've asked earlier. What's the definition of "conservative"? (and let me add, what do you base that definition on?)
Also are you suggesting any type of diversified portfolio allocation, or are you suggesting 100% in the S&P500 (though which vehicle?) If you're suggesting diversified allocation, what's the allocation you're suggesting? Are you suggesting any allocation shift at any time? How about any periodic rebalancing?