haha... great follow-up Grant!
I'm not personally saying I would do it either with my blood, but mostly because it's just not economical for me with 32 snakes in the house. She's a baby, and is in a 2' rubbermaid with a hide cave that she seldom uses. She has a VERY sought after personality - you can even touch her head, and she doesn't even flinch. But, she's a shy feeder. Won't take food dangled from anything. I have to leave it in her enclosure and wait for her to take it on her time.
Nonetheless, I do see your points, but I dunno... it just seems to me that they seek security if they need to, and when they find it, they aren't concerned with life outside their cave. I'd be willing to bet that my baby blood would do just great in a big enclosure, because she doesn't seem to get rattled by ANYTHING... but as I said, it's more economical for me to use a rubbermaid right now.