Carbing/dry hopping/clearing are my main motivations. It would be nice to have a 15 gal brite to rack the contents of multiple 5 gal carboys into. Frees up the FM's and allows me to blend, carb, dry hop, clear and package from one vessel....must be why some smart brewer came up with the idea many moons ago. Of course there is the option of pulling out the credit card, but with the cost of FM's, even a little 1 bbl, is likely going to make my credit card self destruct.