despite it only costing $200 to buy/make the radium, presumably there was a rather strenuous R&D phase (otherwise everyone would be making it, & competition = lower prices) so the chemist charging 10x as much is presumably his way of getting compensation for the time and effort he put in to developing a product that will save thousands of lives...
i mean, in the scenario he's a bit of a ***** about how he says no, but if he starts handing out free samples then EVERYONE's going to want it for free (or will resort to equally extreme actions) and the chemist will be so broke (because he's not even gettin the 200 back) that he can't make any more of the drug, and thousands of people are deprived of a potential cure, and subsequently die horrible horrible deaths...
sure, he's saving this one woman, but dooming thousands... rather selfish
the guy also has a right to make money off an invention... if every drug company was required to be non-profit, there'd hardly be any drug companies... no money, no motivation, so no production, and no product, again dooming thousands of people...
good job, mate...