If evil is more expensive, it will be harder for evil doers to get as much of it done.

It is impossible to control the actions of other people. What they will or will not do should play little role in your own moral determinations. At the end of the day, anything done in business is only done for money. If you do something which you believe to be immoral, being able to say "but I got paid" will not help. If others step in and do it instead, they bear the moral consequence rather than you.

Other people can choose to enable evil: it's their moral failure.