Sure, In the short term, it's often cheaper to do nothing at all. But consider that much of the remaining credibility and usefulness of the platform is quickly vanishing because of lack of these applications (I once again will not limit myself to just mentioning "browsers", since the issue is much more than that), therefore there might be no market at all if they do nothing. If ROL (or other RO company of your choice) were to invest, for the sake of argument, 2500 UKP (i.e, one magnitude less than the value you name), then that could be seen as a excellent return on investment.
Loris: none of the stuff I've done requires me to give it away for free. It's dangerous to make those kind of generalisations - not only is it incorrect, but the licensing between different programs often differs in details.