Imagine these two scenarios:
1. Sweet old lady is walking through Best Buy, when an employee approaches her and asks if she wants a new computer, then sells her on the most expensive machine the store carries.
2. Best Buy employee is restocking when a sweet old lady comes in and says she wants the $2,000 laptop that the sales paper advertised. He knows she could easily do what she needs with a much cheaper machine, but she is the one that initiated it.
In the first case, the employee is obviously taking advantage of the poor old woman. In the second case, it really depends on your individual moral code. So, I guess we'll just have to agree to disagree
