i have heard from a number of yeshiva executives that they expect a high earner to set aside 25% of his income to yeshiva tuition.
Hate to say it (and Al Todin does apply), but you would hope that “Yeshiva executives'” expectations do not limit or force someone to take Tzedaka when it isn’t needed.
Of course, it is possible that the 150K earner has a wife who is sick CV and he can’t afford the payments. But none the less, it is still Tzedaka.