[Snowman]

As should be expected by anyone who reads my numerous posts on the topic, I voted "No, it is unethical to not disclose alterations."

But I don't think this is the point of disagreement that matters most. The more important line in the sand is what qualifies as an "alteration" to begin with. Most people (and ALL grading companies) do not consider a soaked or properly cleaned card to be altered. Same with flatting out a bent corner.