The Vanguard S&P 500 ETF (NYSEMKT: VOO) has become the largest ETF in the world, with $1.7 trillion in assets. Continue »There are many methods for investing successfully, beating the market, and building wealth. But they all have one thing in common no matter which method you choose: staying in the market for the long term. It's about time, not timingThe first thing to note is that investing in the market consistently yields excellent results. Staying in the market, and even investing at the "wrong" time, beats waiting for the low, the dip, or the bargain.