My old company offered exploding offers, and occasionally offered a variant: the sliding-exploding offer, i.e. $8k signing bonus if you join in the next 1 month, $5k in the next 3 months, $3k in the next 6 months. For most people this came down to whether they would travel after college, or go straight into employment (was in Europe).
They offered it in good faith, on the assumption that the offeree was a well informed and rational decision maker who would make the decision that was best for him in the long run. I always felt that students rarely have the faculty to make this decision rationally (cost of a $5k graduate loan vs. some time to travel before working). I know that I would have probably made this decision in a way that I would have later regretted, had I been offered a sliding-exploding offer. So in an attempt to make sure my employer's assumptions about the offeree's rationality were valid, I would sometime have a candid talk with the offeree to help them think through their options - I tried to be neutral wrt to the decision, and informative wrt to the facts they needed. My company didnt ask me to do this, but I suspect they would never have officially asked me not to do it.
They offered it in good faith, on the assumption that the offeree was a well informed and rational decision maker who would make the decision that was best for him in the long run. I always felt that students rarely have the faculty to make this decision rationally (cost of a $5k graduate loan vs. some time to travel before working). I know that I would have probably made this decision in a way that I would have later regretted, had I been offered a sliding-exploding offer. So in an attempt to make sure my employer's assumptions about the offeree's rationality were valid, I would sometime have a candid talk with the offeree to help them think through their options - I tried to be neutral wrt to the decision, and informative wrt to the facts they needed. My company didnt ask me to do this, but I suspect they would never have officially asked me not to do it.