There is a difference between setting up a collection, and having a well established collection and slowly expanding it here or there.
Don could write book on certain C&R rifles, obviously belong to latter type. Searching for bargain is very natural. I have not written anything, even I am searching for bargains. Very normal. If you have a great pistol for sale, you don't have to sell to Don, he's not the only buyer on the market
Market is big.