Darvin wrote:If you're really that strapped for cash even with black market, then you'd be sacrificing many of the items you're buying from apothecaries or other shops to afford the double-cost black market items. If you think it's really bad, then exclude artifacts from the list of items that can be sold. Other than artifacts, it's not like these are items that couldn't appear elsewhere.
The problem with making them cost more as a balancing factor is Translocation Seal. You could make them cost a 1,000,000 gold and it wouldn't really matter. It still helps, but it isn't a foolproof solution.
The other problem with the prep is that it encourages you to only use 2 slots of your Locker, so that you know exactly what you're going to find. Alternatively, preventing Artifacts and Conversion Stone from appearing would let you have more stuff in your locker and still prevent
Basically, I'm saying that the extra shop shouldn't just be added on to an existing prep that's already fairly good. It should replace a bad prep, like Lucky Packets or Extra Elite Items. The latter would make a lot of sense, since it's already a shop prep.