If it's worth doing, it's probably worth paying to do it very well. If you're going to do a presentation or write an eBook, spend the money to do it right.
Paul Durban created this example of motion graphics. It's a lot easier to do now than it used to be, so you get a lot for the energy and money you invest. If you can't be there in person (with an eBook, for example), the energy you get from great design really matters.
If someone sends me a PDF that's just a word file, I rarely make it past the first page any longer. Time to raise your bar.