I think you should collect what you like. I don't think that the present day value or the future value of a knife should be dominant considerations when deciding what knives to purchase. I don't understand people who collect knives they don't like just because a famous maker made them. And I don't understand why someone would not buy a knife they really like because the maker is unknown. Its fun to discover a really talented maker before their work increases in value.
Some knives are too expensive and precious to use.
Others demand to be used. I try to only collect knives that I can at least imagine using. Because to fully appreciate the Art of knifemaking, one has to use one's mind, eyes, hands, and heart.