If you offer cash to customers then you are setting yourself up to receive reviews primarily from those who are in need of cash or have "spare" time. A person e

If you offer cash to customers then you are setting yourself up to receive reviews primarily from those who are in need of cash or have "spare" time. A person employed full-time who uses their tablet daily may be missed entirely. [edit: Not that this is entirely wrong, but it must be one-of-many approaches for customer feedback.]