I'd argue that any game which has past sale point revenue and upkeep costs is a ship with a hole in it. You just have to adjust the bail rate to keep it afloat. UO has managed to keep afloat for 14 years and is still chugging along. I've invested 14 years and probably more money than I've made this year working on UO, because I still think its worth playing, and worth improving, and I will continue to do it as long as they let me.
After having played, WoW, Eve, WHO, LoTR, Guildwars, Rift, Lineage and a few other titles, UO is the only one thats still in present tense.