There have been so many things that were discussed in this thread already. But there's one thing I really don't get ... at all: If you sell the linux version one year late, the retail price will have dropped (a lot?) already. So finally this 2 % of your customers who would have been willing paying the full release price ... just don't do that anymore. Many companies act like that. Are you guys aware of the fact, that you lose money?
In fact a CEO of a game studio said in the past: "If only 1 % of our customers would be linux users, it's already worth porting and supporting." If that's somehow true (regardless of the technical problems with the middleware this time)... mh.