[drcy]

An issue is you don't know what pressing will do to a card later, and don't know that what the pressing does is permanent. There have been instances of wrinkles re-appearing after being holdered.

Clearly, a collector or dealer removing wax stain or pencil mark isn't like trimming and recoloring, and many would argue those are okay and reasonable things to do. However, I wouldn't catalog that as 'conservation,' with conservation be done by a trained professional, or expert amateur, who is considering and is educated in the longterm health and preservation of the item.

I don't want eBay sellers to be able to get away with saying "No, no, I wasn't altering it. I was conserving it."

Unless it's been professionally, or otherwise expertly, conserved, do not use the term conserve.

I do know a collector and board member who is a self-trained expert in conservation (does more than paper items), and I would consider what he does as conservation (deacification of documents, etc). He's also very ethical and transparent about what he does, and, for items such as antique prints and paintings, real conservation is considered a selling point.