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I don't think the intent should be to limit an act to a certain number of albums (or tracks). If a title has enjoyed a great acclaim performance, it should rank where it ranks.
What Henrik does do when calculating and compiling the list- and he can clarify if he reads this- is the following:
1. Gives non-singles a different weight than singles (as singles are more likely to be cited in best-of lists)
2. Gives non-first-singles from an album a different weight (as lead singles usually fare better on best-of lists, especially year-end ones; there are exceptions to this, of course)
3. Not sure about this one, but I'd think it would make sense: Gives a different weight to albums/tracks from years in which year-end lists were not as prevalent as they became from the 90s-on. Look at how many lists the most acclaimed albums in the 2000s appeared on, compared to the 90s, 80s, etc. With Internet access and more outlets compiling lists, that explains the dramatic rise in lists.
4. If a list highlights a main entry and then lists additional ones- i.e. the 1,001 Songs.../10,001 Songs to Download book- the main entries (1,001) get a higher weight than the secondary ones (9,000). Same goes for something like "Other recommendations" that would follow a main entry (i.e. that French book, La discothèque parfaite de l'histoire du rock).
Henrik probably has other notes about compilation methods.
ol, I actually do something that meets your issue. For every list with more than 50 albums/songs with no artist included more than once I assume that they limited the number of entries by artist to one and therefore I blank the other albums For example if there's a top 100 list of albums by 100 different artists and Revolver is included. I would then "blank" Sgt Pepper so that the list isn't used in sgt Pepper's match-ups and hence it doesn't suffer anything from not being on this list).
Thanks for the clarifications/explanations, Henrik. :) It seems to be a very intricate process that you have and only the mastermind knows for sure the specifics.
I did think, though, that you said non-first singles that fared decently on lists had some sort of advantage over first single from an album, because first singles often are the ones cited.