I have been guilty of this myself. You see a recipe and it sounds so good you have to make it. The only drawback is that it contains an ingredient that you have no idea where to find, short of mail ordering it and that takes the spontaneity out of making the dish that day. Or you substitute some mundane item for the more exotic item and the recipe is a failure or just not very interesting.
These boards are filled with "where can I find...food-grade lavender, pea shoots, zucchini flowers, Armenian cucumbers, etc. in XYZ city, state?"
Shouldn't it be the other way around? You see some interesting food item at the market and then you go home and scour your cookbooks or the Internet for a recipe?