People don't become president because they want to get rich; most of them are already rich, and could make more money if they were working in the private sector. (Although being an elected national politician has great benefits, like pensions, security details, health benefits that are far better than almost anything you'd get privately, etc.) In most cases, they want power. So you're going to need to offer some kind of equivalency.

At a certain point, money becomes raw power, but it's not when it's just a million here or there, not anymore. After all. the president may not have huge amounts of money, but he has the ability to suggest that the DoJ to start investigating you.