Depends on what you mean by knives that are intended for display/investment purposes. If you're talking about the Buck knives with mirror finishes, cutouts, etchings and stuff like that... I just don't buy them since I don't really purchase knives I don't intend on using. If you're talking about limited releases with collector value like the BotM's, BCCI knives, etc then that's a different story. If they have premium steel or a handle material I prefer, I'll buy them and use the crap out of them.