I made roasted bone marrow for the first time, and it was not bad. Thing is, the grassfed bones cost $3 a pound here in Boston, and most of that is bone weight. The fat is really an accessory to whatever my protein is for the meal, and the bone will be used to enrich a soup. But for someone without a ton of cash, is it worth it? (don't tell me it depends on my preferences!). If the bones were cheap/free, I'd get them all the time.
I like the taste okay, but not as much as butter. It's probably quite nutritious. Are there dishes you've made that just scream for using bone marrow? If so, I'd be down to buy it occasionally. What I really want to do is eat it on toast for breakfast. Alas, my heart says yes, but my brain says no :(
(Also, those are greens with coconut-lime-chili dressing, and mushrooms fried in ghee! I'm finally learning to cook!)
Hmm, doesn't look like you got the nicest bone. I usually get my butcher to give me the best ones with the highest ratio of fat to bone...because I'm a flirtatious gal ;) I recommend the recipe in Nose to Tail at Home. It's delicious!!!!
I love bone marrow, but from a technical point of view grassfed butter might be a better bang for your buck. It's pretty similar nutritionally, though I think marrow has more minerals.
$3/lb is more than I would be willing to spend. I have a hard time believing there is so much demand for bones they have to charge that much to ration the supply. More likely it's marketing based: charging a lot creates an impression of a luxury item in the minds of consumers. Since most people will only occasionally cook with bones, or throw one to their dog ;-), they might not blanch at $3/lb since it's only a few bucks.
If it were me, I'd try to find another source, or ask if the butcher will give you a quantity discount. He might well be throwing most of them away. If you're going to buy 8-10lbs worth as a pre-order, and you don't mind if they are a little bigger and/or irregular (he might spend a lot of time cutting them up into cute little 3" segments), you might be able to get them for $1/lb so something.
I wasn't able to find much info on bone marrow other than it is basically fat. I haven't seen any evidence that the fat inside the bone is any healthier for us to eat than the fat outside the bone. I tried bone marrow and to me it tastes similar to other meat fats. But it's a pain to get out and is not super cheap around here. I suspect in ancient times, fat was a very valuable commodity and not wasted. In modern times, IMO, it may not be worthe effort if you can't find a cheap source. How much do you want to pay for a few bites of hard to reach fat!?!
Not really a response to your question but more so a recipe recommendation: There is a great burger joint here in the DC area (Arlington) called Ray's Hell Burger that I love. My fave burger is called the "Dogcatcher"- sirloin burger topped with bone marrow and parsley (no bun for me obviously)... delicious... If you are ever in the area you should get one or even better try making one at home!