Nothing is worth eternal suffering, whether it involves souls or your brain-state being loaded into a virtual torture chamber. It’s one of the reasons why having a soul would be highly undesirable if they actually existed; if they did exist the best course of action would be to find a way to destroy it.
Also, if somebody offered to buy my soul I’d worry what scam they were running and say no* despite* not believing in them. Don’t make deals you don’t understand.