The number of the pressing plays a role in the world of collecting but when a record is very old the number of the pressing is inferior to the amount made. This can simply be explained by the basic ‘supply and demand law’ of economy:
“The price (P) of a product is determined by the amount circulating/existing (supply (S)) on the market and the amount questioned (demand (D)) by the consumers.”
So translated in the world of record collecting this means that when a record is highly desired by collectors and short in numbers the price will certainly be at it’s highest.
Or also when a record is not much desired the price of it will be lower. Or when a record is old and due to damage or loss short in numbers, the price will also be higher, because there are less existing (especially in good condition).
If you want to take this professionally, you should always be aware of trends also. Or when you have a distro or label you should keep the last copies of a record that sells out fast. This is something I do on occasion but mostly I collect records that I like or that meant a great deal to me. And sometimes these two approaches converge with each other. Then it is kinda cool.
My conclusion of this is that the condition of a record is the most important factor. Because vinyl records are mostly falling into the hands of collectors. But the way they handle the record is definitely showing a collector’s worth. The newer an old record looks, the better the message of a record comes through. Also since vinyl records almost never disappear, the condition he is in is the only variant.