???

The inference, perhaps one of multiple inferences, of the question is that posting this information might have some sort of deleterious repercussions. If that is the implication, the answer to the question (for me, not trying to put words on OP's keyboard) is it’s because the entire raison d'etre* for these forums is to share information which can improve one’s travel experiences.

Some people believe that sharing information in this manner will lead directly to shutdowns and/or devaluations and/or elimination of various perks and loopholes, those people should reevaluate their participation on public forums. Unfortunately there are some who participate here only to take (learn) and never give (share what they think is secret information).