Anyone who knows me knows I play on the EC only. Why? I enjoy the advanced functions of it. Equipping entire suits instantly with one button, faster speed, more interface user friendly, making macros is easy, the list really goes on.
The graphics is something I am not too fond of, but I have gotten use to it. I don't play UO for the nostalgia, I play it to spend time with some friends and get my pvp fix.
From a business perspective, its important to invest time into the client which will appeal to new players. I doubt anyone 100% new will be able to understand, or even want to fuss with the complication of the Classic Client. The in game map is awful, macros? icons? I mean honestly, if you never played UO before, there is no way in hell you would start now in the classic client without someone helping you. CC is on life support to appease the people who value the nostalgia over all else. I think its unreasonable for our skeleton team to invest big time and resources into making two completely different game engines more modern.
So that's why I made the choice to begin playing the client that was more user friendly and more modern. But yes, its not exactly pretty to look at.