You know, where the character is actively rewarded for, and celebrates some 'negative' ethical attribute? Dungeon Keeper, God of War, most action video games, etc.
Well, if they're paying you money to lie, and more money to lie bigger, then seems to me that's the same dynamic. It's a reward loop, with a context. Doesn't seem to me that this would be any more likely to cause an increase in general preference for lying, than the millions who played Dungeon Keeper being more likely to turn to workplace abuse as a first resort.
That said, context adds a lot - the classic Stanford Prison experiment and similar studies showed how far context and roles can push people with very little prodding.
Seems to me, that more thought should be put into what roles we're building for folks, especially with things like the stock market, the legal system, and managerial roles. Unbounded reward loops have a way of being pushed until something really bad breaks, even with 'normal' people.