Yes - 100% - They should be willing to tell anyone who asks exactly how they achieve their images

Yes - They should be willing to disclose their techniques but some vagueness is OK

Yes/No - Answering some questions is OK but not disclose anything which has taken a lot of time to develop

No - They should point people in the right direction and encourage rather than disclose anything specific

No - 100% - They should always praise and encourage other artists to experiment but should disclose nothing

Yes, works should be updated or reworked if the artists thinks they can improve the work enough to justify.

No, old works should stand as a history of the artist's progress.