In all WW collections, the vast majority of stamps are common. The value of the collection, aside from breadth of countries represented, is in the depth of the material where more mid to high denomination stamps are represented.
However, if many of the more common stamps have visible flaws- short perfs, rounded corners, small tears, and visible stains or toning, the auction house will quickly develop skepticism as to the overall quality and value of the collection. The only safety valve they have is to push the collector or family to accept a lower start bid or other compromise to reduce the likelihood of a no-bid lot.
Rare items are an exception, and many of us have engaged in a lengthy and spirited discussion here recently about collections of extremely rare stamps and the expectations around condition for these collections. All that said, I have seen this process play out many times at bourses and other philatelic venues. As the dealer reviews a few countries, if they see consistent representation of basic stamps with the flaws I mentioned above, they quickly assume the collection is full of weeds which greatly affects their level of interest in the collection. The assumption is if the collector didn't take care to collect quality in the basic stamps, the medium to high-priced stamps will have the same problems.
Knowing how many $100+ stamps or $1,000 stamps are in the collection is a guide, but that info does not speak to the quality of material and thus the true value of the collection.
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$600,000 of catalogue value for $96,000 doesnt sound like a very good deal to me.
This could be true, but what if the live bidders/buyers including agents had carefully examined this collection to learn it was of higher overall quality than a typical WW collection? It actually may have been a great deal.