That is completely subjective, Hank. What it all boils down to is what works best for you. Some folks let their plants get to huge proportions because, as you mentioned, you can get some magnificent floral displays that way. However, those same folks are almost always people who have plenty of available space. Personally, I rarely allow a plant to even get to the 6" pots size and rarer still to hit the 8" or bigger. I simply don't have that kind of space. So I divide my plants when they get bigger than I want and usually trade off the divisions or donate them to my old os for their auctions.