Traders who bought on the dip at the end of last week were a bit early, the market is saying today.As of noon New York time, the Standard & Poor's 500 was down 1.91%; the Dow Jones Industrial Average was off 1.56%, and the NASDAQ Composite was lower by a whopping 2.75%. In the last two days of last week, buy-on-the-dip traders put $1.7 billion into the Invesco QQQ Trust ETF (QQQ.) More "adventurous" traders added nearly $600 million to the ProShares UltraPro QQQ ETF (TQQQ) on Thursday. The TQQQ is a triple-leveraged ETF that aims to deliver three times the daily performance of the Nasdaq 100. In Tuesday trading the NASDAQ 100 fell as much as 4.3% and is now down close to 10% in three days of selling.