I'm really curious. I see everyone that enjoys the large lathes but honestly, how much of what you are turning that is that big? Not saying there are not reasons to have a big lathe, but unless you are building something specific that is large or running a job shop out of your basement it is usually just excess capacity.
If you are not going to be doing stuff that requires a large lathe, why mess with it? Mine is not that big but I can still pass 3/4 in through my spindle. I can turn things as large as 3 inches diameter in my chuck and as large as a bit under 7 inches on a faceplate. I have been turning things as long as 6 feet long Acme all-thread in my lathe. I honestly can say that I have not come up against much that I couldn't do with my little lathe.
The majority of what most people turn is pretty small stuff. Bushings, fasteners, shoulder bolts, tooling, a little work on the end of a shaft, a bit of screw threading.