A more important reason is that the bands will intuitively trust someone they think is a peer, and who speaks fondly of the same formative rock and roll experiences.
When success comes, people can try to trick you or take advantage of you.
I guess by taking lessons early on, and really trying to play all the rudimentary stuff, and try to have it sound as good as my teacher. It took a lot of practice, which I enjoyed, and still do.