Problem 1: They haven't seen the product.

Companies that use standard images and order back-to-back from their suppliers have never usually seen the items that they are selling. This means that they can't give you accurate information about the items, or know for sure whether the goods are up to scratch in terms of quality. When you buy in advance you can foresee any problems like this, and advise your customers of product characteristics and quality.

Problem 2: Inaccurate stock and delivery information.

Very often the worst problem is that the manufacturers and suppliers can be inaccurate with their due dates. After all they don't have to pick up the phone to angry customers awaiting their goods. Supplier deliveries can be subject to delays which are out of the retailer's control. If you need furniture for a specific deadline it's important the company physically has the stock in their warehouse, or can give you a solid due date they that are confident about.