It actually applies to ALL firearms, but only 10-'s are listed here. I like the concept of a good wringing out.
Guns become collectible for a VERY few reasons.
Also buying a collectible with a name like Ruger can have additional dangers. The main one being that since the manufacturer is still in business, they can always stoke up the assembly line, and churn out 50,000 NEW models killing the market for the old model. This happened with the Ruger Bearcat. I think my list is the major reasons for making firearms collectible, there may be more, and if you know of one, drop me Email. The manufacturer was FAR ahead of their time, far too late to have another generation of users to appreciate it and support the designs continued manufacture, or was overpriced.