No, morals don't exist. Everybody is Machiavellian.
No, it isn't a good idea to set your sights on short term gain and put long-term prospects at a disadvantage. This is just plain ****ing stupid.
In the long term, being a con-man will **** you. True success in life comes from building relationships of trust.
You need to give people the feeling, "Yes, I'd lie, cheat, and steal, to **** the COMPETITOR, but I'd never **** *you* over."
As everyone else said, it is an effective method for securing one night stands.