@dislekcia I don't really have a problem with the current system. Wouldn't mind if the bonus locker slots were a little cheaper, but whatever. I just did a run of BM silver to test your point... bit of a challenge; took two tries (last I did it, BM wasn't restricted to 7 mana to start). Not as fresh in my mind as the vicious dungeons, and I suspect that would hold true for many silvers. But I think the point is fair: if you want a specific quest item or vicious reward, go get it.
There is a slight issue with dev logic when it comes to consumable items. You can't really experiment with Zot, for example, without scumming for it, but there aren't a lot of them, so it's not that big of a deal.