Not that I am trying to discredit what Cates is doing on the book, he's one of my faves, but from what I understand Venom is always a strong seller. I know it doesn't seem like it should sell quite so well, but he (they?) apparently has a very strong fanbase, but one that is mostly silent online. Go figure.
Having another look at the part where Loki got the Necrosword, he did decide to go get it, after seeing what it had done. so he's not completely innocent here. But I do think it still will make him act worse than he would normally.
And between this new origin of the symbiotes, which involves Thor in a prominent role, and the whole God Butcher story also tying things to the symbotes, I am wondering if we may be getting a Venom crossover in a bit. Not a crossover I would have expected for Thor, but it would make some sense now.