I think Ultima 7 should be counted only as one game. The same with NWN + Mask of the Betrayer.
I was thinking about this... I now have 153 votes accounted for, and I think is enough of a sample to take some decisions.
The only games we have people voting for the base game and the expansions are Ultima 7, NWN 1 & 2 and Baldur's Gate II.
When people voted for Ultima 7, they mostly just vote "Ultima 7", with only few people specifying "Black Gate" or "Serpent Isle". Same thing for NWN 1 and Baldur's Gate 2; most people vote for the base game, with only one vote for the expansions on each case. NWN 2, on the other hand, the overwhelming majority vote "Mask of the Betrayer", with only two people voting "NWN 2".
Based on this, I intent to count all U7, NWN 1 and BGII votes as the base game, and all NWN 2 votes as "Neverwinter Nights 2 - Mask of the Betrayer", unless someone has a better idea.
The other suggestion was joining votes for M&M 6-8. Both M&M 6 and M&M 7 are on the Top 30, and are fully separated numbered games of the series, never being fused like in World of Xeen, so I'll keep them as separate games. Counting the votes as one would just be unfair M&M favoritism, since i'm not doing it to Wizardry 1-4, Geneforge, Quest for Glory or any other similar series.
As long as the campaign of the expansion is not a part of the original game campaign, it should count separately. Thus MOTB and Serpent Isle should count separately, while Dead Money for New Vegas shouldn't.
I see no difference. In Dead Money you take your current party to a area of the original map, and that takes you to a unconnected new expansion area, just like in Serpent Isle.
EDIT: Fuck, I went to check on this, I remembered wrong, Serpent Isle doesn't work like that and even has a time jump... fuck. Now I'm unsure....