So, no, volume is neither bullish nor bearish nor does it have any predictive value. However, heavy volume does tell the trader where major players see value (which provides the basis for "support" points and/or levels and/or zones) and where major players see overextension and retreat from continuing to pay the ask (which provides the basis for "resistance" points and/or levels and/or zones). It also tells the trader, if "light", where major players are not interested, either because they're already in or because the price point or level does not represent value to them and hence provides no reason to act. Of course, if the trader has no interest in what institutions, etc, are doing or not doing, then there's no reason to include it in one's decision-making. That does not mean, however, that it has no value in the absolute.