You wouldn't consider it evil to push bad products onto thousands of people with a technological tool, where before you could only push that product onto hundreds?
x1: How much the product improves my life (judged based on how much I would be willing to buy it, asked after I acquired it)
y1: How much the product costs
x2: How much expendable income I have
y2: How aware I am of how advertising influences my buying decisions
Depending on where the marketed products/services and the targeted consumers land on these charts the answer to your questions may turn out very differently.