Typical banquets take 10+10 meats (2-10g apiece), 25 veggies (50s-3g apiece) and an ironpaw mat (selling on my realm for 100g+ apiece). Total 150g-375g for a stack of 5.
They sell for 5-15g apiece. That is, 25-75g for a stack of 5.
Greater banquets have a similar loss. Clearly people are leveling cooking and dumping the results, especially the ones hitting 90 and running out of things to do. So the question becomes: what will the banquet market look like in 2 months when all the furious leveling draws to a close?
Limited by the supply of ironpaw tokens and therefore the banquets go way up in price? In other words, buy now, profit later?
Unlimited by the supply of farms and crafting mats and therefore the mat prices come way down to be in line with the banquet prices? i.e., just stay away.