Our 2nd will be joining her brother at a private U this fall. Our speech is similar until we get to the “because” part. Ours is “because there are four more coming behind you and you don’t have the time and we don’t have the money to waste.” (No long vacation for us.)
Because they knew it was eventually THEIR money on the line, they didn't waste time on silly courses. They got what they needed for basic courses, and what they wanted for their majors, and limited their debts as much as possible.