If a blem is all that's reasonably left, then hell yes. I thought I'd never find a particular knife that was discontinued and, lo and behold, Dave's got them as blems. He scoped out a good one, and it's mine. It's a knife I'd never carry (I couldn't if I wanted to), but it sits in my collection and I enjoy playing with it.
I think I only actually have two blems, but for me, having a piece in my collection is about the model, the design, and enjoying the piece as the product of someone's thought and craftsmanship. It's why I even have a collection. Blems are a great option to just have a piece that would otherwise gone unhad. Especially since Dave scopes his out pretty well, it's a good way to add to one's collection.
My EDC is a CF154 Blur. It wasn't a blem, and it's seen some serious stuff at this point. I got three of them...so I'm fine using what was a NIB piece.