Wylie, get your son to check his assumptions on redbook.
Below is an example
Based on the redbook figures below, the price depreciation between a 2 and 4 year old Saab is 30%.
If he pays 40k for a 2 yr old Saab, and sells 2 yrs later, he will lose 30% of 40k = 12k.
Further, he will not...