I doubt what I can offer is indicative of anything in the US, really. But here goes.
With the Defender versions, which is what I mainly get, they tend to go cheap once opened (especially if the foil is opened and the kit assembled). Although they're already cheap to begin with. I don't think anything outside the rares really go for much. (The following are local prices, which I'm surprised to see are so different from the Blokees site's.) If a Defender Version blind box is $2, identified regular chases are $6 and the super chase whatevers are closer to $20, and opened/identified everything else is between $1 and $2. A sealed case is about $20 here. It can feel a bit disposable pretty fast, to be honest, which is why I've tried to keep it very minimal.