You don't make money on entry or exit, you make money during your holding period (if the market goes your way). Also, even the perfect entry with amazing risk/reward, fairly soon becomes mediocre risk/reward once the early "easy" profit has been made.
Consider a market move from 100 to 150. Entering at 101 is great, but does not by itself give you a great profit. It is better to enter at 110 with poor entry skills, and have good holding on ability, so you sell at 140; rather than to enter near-perfectly at 101, but not know where the market is going by 105, so you sell prematurely.
The ideal entry here with mediocre holding ability gets you about 4 points. A poor entry with good holding ability gets you 30 points. The great trade entry guy makes 4 points with about 2-4 points risk. The great hold guy makes 30 points with about 12 points of risk. The guy with good holding ability makes 8 times as much per trade for only 4 times as much risk, a superior profit profile and superior risk/reward profile too.