I probably just don't fully understand the situation, however this seems bad. I'm usually for capitalism and the concept of supply and demand, but not in this case.

What's my marrow worth to me? Probably not much; a bit of time and discomfort but overall not a huge deal. However, for the buyer, it's the matter of life or death. Seems like it would be easy to extort someone who needs it.

This is one of the rare cases where I hope the market is very heavily regulated -- say, "Bone marrow is worth $1k. It's illegal to ask for more."