That's one of the main reasons I got into game used/worn jerseys. In college I pretty sizable collection of "authentic" and replica NHL jerseys. I doubt they are worth 10% of what I paid today because they're a commodity over the counter item. Game used on the other hand is one of maybe a handful, has some historical value and if you are reasonable in what you acquire, you can get it for WAY less than the "pro quality / authentic / on-ice" jerseys sold in stores. You can go to a dealer than handles NHL teams and get a game used jersey of some cup-of-coffee NHL player for like $100. Sure its nobody you've every heard of, but it's $100 and already has a name and numbers on it. They get big bucks for the big name players, but they also need to move hundreds of jerseys from players no one knows or cares about and will forget next year. Not to mention game used jerseys are what the teams actually wear on the ice - you're not going to get any more authentic. NHL retail over the counter "authentics" are pretty much what the players wear, but NFL "authentic" isn't even close to the what the players get for game use.
Ryan J