Decoy is unnecessarily pejorative here. This is known as price anchoring. Anchoring is an influence tactic based on human psychological bias.
I am not really sure why ethics would come into this discussion. Do ethics come into picture when you are considering/selecting databases or programming languages?
can you help me explain how this might work for metered pricing? for example generating 1000 reports costs $100 so 1/10 of that would be $10. What would a decoy pricing plan look like?
Two questions:
(1) would trying this with products that don't include anything physical alter the effect?
(2) how ethical is it to use the Decoy Effect?