I have no doubt that there will be plenty of lore, events and exciting things. But for some, who have personal goals for their character and are RPing the process of attaining those personal goals, the overall world lore and events don't mean as much. I happen to be one of those players. I am sorry, but I just don't have time to follow the world lore and I don't enjoy that as much. BWT, my character goals are not the accumulation of wealth, wealth is the vehicle to achieve those goals. To be honest, I believe that there are many players who feel the same way. I know it sucks to hear that, but I believe it to be more true than people are willing to admit. I ran an RP Game server (Neverwinter Nights) for seven years and I tried my best to get the player base involved in the world lore, but it ended up only being important to only about 20% of the player base.
I firmly believe that in this case, if you take the character's hard earned accomplishments, it will turn many players off. Partly because they lost the items and minas, but mostly because they will feel betrayed and will always wonder if and when it will happen again. I know that is how I will feel. I won't leave the server, but its only because I have donated and i am invested. But I will not enjoy having to start my character's personal goals from the start again. If I had not donated, or my money were refunded, I would leave the server and I would hate leaving, because I have very much enjoyed my time here.