Most graphics studios, design and advertising studios, and pre-press service bureaus have more than one scanner.
Different needs require different scanner solutions.
A high-end flatbed and certainly a vertical Imacon can provide enough dpi to result in a professional looking banner or display for a trade show. Low-bid is one way to buy scanners. Except that eventually you will be disappointed. The recommended way to buy a scanner is based on the class of work needed to be achieved and what level of professionalism is desired. Once you have a good scanner you can potentially earn a better income and pay for the superior equipment with new earnings from happier clients.