No need to rephrase.
Putting $1500 in an ETF like the SPY for the long term is no gamble.
Betting that these 500 will go up over time without the proper knowledge as to what they’re doing/finances are, isn’t the same as betting on one particular company, you’re betting on the American economy — long term, safe bet, just buy it.
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If one doesn't know or understand what they're doing, it is no better than a gamble.
Sure, in the long term it will go up, the question is what is defined as the long term, and what will happen in the interim. Could a $1,500 investment into SPY today be worth less than $1,000 at any point in the future? How would the investor react if that would happen? What are the expectations? Are we trying to time the market with a one time shot? Will we try to time the market with a one time withdrawal?
Stock prices rise based on two factors: Earnings growth, and P/E expansion. If one were to invest in SPY, I would say one should first look at
http://www.multpl.com/ and probably
http://www.multpl.com/shiller-pe/ in order to gain some good perspective as to the price being paid.