It's a tradeoff sometimes. Sometimes it's not, but it's often a matter of time vs. results. If you are doing a picture that takes 24+ hours to render (like my "Sanctuary") image, and you are an ordinary home user with 1 computer, that means you just can't do anything else for that whole time. That can be a major bummer. I am always interested first and foremost in getting an image out of my brain and into a viewable form. Once I've done all the work, which may take days or weeks of labor, I want a good final product. Sometimes that just means I have to wait (and wait, and wait, and wait) for the rendering to be done. If I could get faster rendering, I could be on to the next one(s) of the gazillions of projects seething in this quagmire I call my mind. I always have at least 5 or 6 images "cooking" at any given time, and when I have to wait for a long render (which I will certainly do when necessary) the other projects tend to start knocking up against my mental walls, wanting "out."