Earlier quoted context omitted.
Read more about this. Depends on the definition of the "big deal" but from what I can understand the problem is that they buy rare things - which exist in just several copies - and they tend to buy _all_ copies.
Where did you see they tend to buy all the copies? This comment is the first time I've heard of this.
Of course they aren’t buying “all copies”, and that wouldn’t even be possible in most cases since such books are usually flea market/attic material and most copies aren’t for sale (or even catalogued) to begin with.
I’d be interested to learn who comes up with such lies though. Is it really just random people venting their frustration, or some kind of organized astroturfing operation?