Editor's Note: This content was originally published on Benzinga.com by The ETF Professor Benzinga Staff Writer. Apple's (NASDAQ:AAPL) recent slide from stratospheric heights has reminded ETF investors of the dangers of owning funds that are excessively weighted to just one or two stocks. The risks of too much Apple have been previously well-documented and the scenario is arguably as simple as this: Large weights in any ETF to a small number of stocks work...until they do not. Everything smells like roses for an ETF or mutual fund with substantial Apple exposure as long as the stock keeps going up. ...