One good
parametric equalizer is all you should really need. But since music is an art form, there's no "ideal" equalizer that everyone loves. It's difficult to convince anyone that this particular EQ plug-in is a one-size-fits-all solution.
So normally what happens is some people often end up buying multiple EQs in search of the "perfect" sound. Yet if you really think about it, this isn't financially the best use of resources. It's also important to remember that most equalizers essentially do the same thing. So if you have a good audio monitoring system and you should be able to find a single EQ that suits your needs.
Another thing is marketers in the audio software industry have done a great job of convincing people that...