I think it depends on the author. So far I have been more of a reader of what are considered philosophical books, more than literary ones. And what I find to be able to, more than simply make it "more interesting", but deeply change the way I see the books is to do what you are asking. With many, if not most of what people call philosophers, there is really nothing that would change your way of seeing the book. Usually their life stories consists of, well, just "generic" ones.

Take David Hume for example. He was struggling to sell his books but that's about it.

And it may even be rather "painful", like Immanuel Kant who perhaps may even be regarded as having "no life", as they call it (although I don't reccomend mindlessly deriving wisdom from public opinion), which I however agree in that he may have been too immersed in something that he didn't necessarily enjoy to begin with, because he didn't "get it", meaning, the whole point of life which is, well, to live I guess.

And it may even make you feel "more cynical" about the book (although I argue this would be a rather wrong line of reasoning; you may become "more cynical" about the author, but not the book; the book should stand for itself regardless of the author). Arthur Schopenhauer was the son of a wealthy merchant (and was able to keep his wealth to the end of his life since he was not insane or anything), who preached about the importance of, for example, asceticism, which is the activity of not doing much activity, such as not eating. This makes some people angry since he was able to say that while having the chance to eat whatever he wanted, being a wealthy man, not least one who didn't bother to discuss the socio-economic system whatsoever other than that you should do charity once in a while if you're rich.

But once in a while, perhaps in a whole millenium, there is gonna be a person like Friedrich Nietzsche. His whole life is his book. It is one of the greatest novel I've ever read. He is the epitome of a tragic hero. Reading his life story, you will find the change from a "nice", religious child, to a ferociously inquisitive teenager who was still "nice" nonetheless, to a man completely struggling with everything he was brought in. His whole life he was immersed in a vigorous pursuit of figuring out what kind of life we, as an individual, and as a whole humanity, should live, and he not just applied, but breathed in whatever discovery he made into his own life–something which I find very moving.