From where comes this massive desire to raise mp3 volume or increase the volume? Well, simply that any digital reproduction would uncover and easily detectable changes in volume of the mp3s that are generally obtained by people from many sources.
The problem usually comes from the decoders have not put attention on standardizing the volume of mp3s, so they are creating chaos in respect to volume levels in the mp3s, which drive the user to search some mp3 normalizer.
Download the Trial version of Mp3Doctor PRO and process some of the mp3s. The results will surprise you, the volumes of mp3s remain matched compared to other mp3s and will have been adjusted to sound the best posile. In summary, although the common user usually refers to increased volume or volume amplification, in fact normalizing mp3s today performs a function much more professional, while allowing for equalization, change the tempo, pitch and make some instrument overlooked in the original mp3, can be easily listened after normalization.
It is not "a war of volumes" between the mp3s of the collection, what should be done is to try to bring the volume levels so they can be enjoyed by listening. Without the need to raise and lower the volume knob.