The most difficult thing to do in trading is to stay in a trend to maximise profits. No market ever moves up or down in a straight line and when the primary trend develops a reversal or pullback, these are the points at which emotions rise and the desire to close out and take profits off the table is very strong. Unfortunately closing out early adds to the problems of the maths of trading, which is based on small losses and outweighed by larger profits which have to be extracted when a trend develops. VPA is an extremely powerful tool in this respect and helps to identify whether the pullback is merely a secondary trend and therefore one where the primary trend will be re-established for further profit potential.
Of course in addition you also have all the Quantum tools and indicators to help further such as the Trend monitor and the Trends, but VPA helps to reinforce the analysis and also removes emotion as you move to a logical analysis of the chart, rather than one based on emotion.