You may be right about why resto was created, but perhaps not. Some of us like restoration for many, well documented reasons, most of which could not be ascribed to greed. Since resto lowers the price, one can hardly call losing money greedy.
Now conservation on the other hand.....
It seems to me the "conservation" term came around as an attempt to do an end around on the devaluation brought about by restoration.
For example:
"Sure I sealed that tear, but I did that to CONSERVE the book, you know keep it from tearing worse. It's not RESTORED! I did the book a favor."
Sounds like salesmanship to me at worst, semantics at best.
I do see your point ciorac but surely there are some exceptions. Rusty staples for example.
Someone might be willing to leave rusty staples if they didn't think it would spread and, in the long run, destroy the book. I have a comic right now with this problem. I am fine with how the book presents even with this defect and would not consider restoring it. I will consider conserving it though because I fear the rust further migrating into the pages.
Now there is some salesmanship for ya!