Because if they actually build to demand and make some money in the process, they will be in a far better position to meet their educational goals than if they deliberately hobble themselves. Failing to take advantage of people throwing money at them is positioning themselves for failure. However good and fuzzy that may make you feel, in the real world they will be failing to accomplish their goals to the extent that the could have, and I for one think that trumps fuzzy feelings about not sullying one's hands so they could serve thousands instead of millions. YMMV, I suppose.