For instance: Did you try writing your name on a demo machine, and the salesperson sidled up to you and admiringly commented that you have "a real knack for this?" That's a sales pitch. And just purchasing a longarm machine does not guarantee that you will be able to use it successfully as a business, because a longarm machine is essentially like a paintbrush and paint is the thread. Just because Pablo Picasso and Georgia O'Keefe painted masterpieces with a particular brand of paintbrush and paints, doesn't mean that all of us are capable of creating the same caliber of artwork even if we use the exact same paint brush and paints. The award-winning longarm quilters whose work we admire at shows are exceptionally talented artists, and although practice and work and having the right tools are all important for developing talent, that artistic talent needs to be there initially.
Clayton also points out that longarm quilting, especially as a business, is very physical work. Do you have back, neck, or shoulder problems? How is your upper body strength? If you aren't a physically fit person who exercises regularly, you might find that your body can't handle quilting on a longarm machine for hours at a time, day after day.
There is much more to think about before taking the plunge and ordering a longarm machine, and Clayton covers most of it in this book. The information in this book (as far as pricing, machine options, additional tools etc.) is still very much up-to-date, and there are also a score of links to videos and additional information throughout the text that enable you to learn even more and expand your research further. Highly recommended, definitely worth reading prior to committing to a machine purchase.