That's a great way of thinking about. "Look, you can find the tomb, brave its dangers, and face down the boss at the end in order to get the sword. Or you can find this other tomb, brave its dangers, and face down the boss at the end in order to get the ingredients to make a sword just like it. Take your pick. The magic store would be happy to provide you with some rare inks and a live carp, if that will help."
Less one just like it (unless they are following really good legends or other Intel) and more if you go this way you get whatever ancient treasure is in there, if you go the other way you can get the thing you need to make this specific thing you want (again assuming the research is good, but it would be a dick move to make them put in the effort and find that it isn't an actual component).