Final answer:
Poor design decisions that make it impossible to meet customers' needs are the most common customer turnoff that affects organizations' revenue and sales.
Step-by-step explanation:
The customer turnoff that happens most frequently and affects organizations the most with their revenue and sales is poor design decisions that make it impossible to develop a design that successfully meets customers' needs. When an organization fails to understand and address customer needs in their product or service design, it can lead to dissatisfied customers who may stop purchasing or recommending the organization's offerings. This can have a significant impact on the organization's revenue and sales. For example, if a smartphone manufacturer releases a phone with a poorly designed user interface and limited features, customers may be frustrated and choose to switch to another brand, resulting in a loss of revenue for the organization.