I only read a few of the first posts, so maybe this was already mentioned but.
Dark Souls 1 and 2 were notoriously painful (I only played 2 for a few hours and imo it sucked) and people loved it. I don't think it sold a TON of copies, but I am pretty sure that it did well. I think there is something out there for a product like this in MMO style, yes.
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