Hi MikesUnique, welcome!

If the donator of your stamps was going to open a store, did he have a lot of stuff marked or did he have it sorted into really good / good / average type of stuff?
There are many different types of collector and levels of collecting.
Time, money, passion, other commitments, life stuff all affects things.
I've never thought of stamps as antiques although technically they are. They are just stamps, well designed, well engraved, well printed, well cancelled, etc etc and then the not so well ones. But all are part of the stamp world.