It is really hard to estimate an overall total value of someones UO holdings.
I my special case, most of my characters value comes from things that I dont use/couldnt yet to decide on. Like 7 vet rewards (4-5years and 3-3years if my memory serves me well) or an unused pre-patch golem (100 poison resist= or, or, or. What about Soulstones? Actually you can get good prices on tokens but claimed ones are useless for anyone else (and therefore without value).
I guess actually the question should not be, 'How many gold would get, if you would sell everything?' but morelike 'How many gold would you need to spent, to replace/build a copy of your uo-belongings?'
I gave an estimate value of 25-50 mills but when I look at those items, it always feel like beeing nobody among all those super-riches. On the other hand ... with 5 full soulstones on my acc(s) and seven more to pick up from vet rewards, I would need around 12* 12-14 mills only to replace them, if I should loose them. (And if I could find enough of them for sale.)EX
I really dont know, why I am not uber rich ... Maybe becourse I am too lazy to follow those simple patterns to make money. Or maybe course I guess it would feel more as working a game instead of playing it.

And if someone wonders, why I have highlighted something of that quote .... You can buy glass swords from the blacksmith npcs of Ter-Mur. I always wonder, why some ppl are not fully consequent, when they build up such a pattern. Maybe some of you should work on learning the games principles instead of breaking their minds about getting rich online.