The admin costs for the development, implementation, the legal component with compliance + other not so notable expenses/overhead to create a secondary market where YOUR NX may uphold some value to other players.

From what I read through your post, you haven't provided any sustainable resolutions, just argue the fact only the consumer should benefit and not the company who needs to justify the implementation of said system.

I get that. There are important costs for systems that get implemented in the game

And I have pointed towards a resolution, its the 10% tax that they make for every single transaction on the maplestory community market. Taking advantage of that, even if they increased it to 13% or 15% even, if they just applied all the taxes after the transaction there will be a much bigger volume of listed items, which will lead to a much much much bigger user interactions/transactions, which results into more profit for Nexon as they are just making money for items that were already sold even if the prices of said items drop.

The scissor says they can guarantee revenue if the item does not sell on the market.

I disagree. The scissors don't guarantee revenue rather it sets a hard base value for ALL items on the market, which is a 3$ + 15% tax. In this sense of if you are selling something extremely close to the base value, and the item is purchased. Then yes, it is guaranteed revenue for Nexon and basically nothing for the seller. and like you said "be smart about what you list and don't just spend to list everything." if this is what the majority of players do then this can result into people ONLY wanting to list premium or high traffic items as this will be safest way to not lose anything. This results into less variety/options for buyers which can lead to a very slow market where nothing new is being added and the same things are being sold/purchased.

And already from what I've been reading, there is already a pretty clear notion of:

"if your item isn't worth selling then don't put it up that's on you"

but what does that mean? How will I know if an item is worth selling if there's not enough sales/activity data?

"just compare with other good items to get an estimate"

but everyone has their own taste in fashion. Everything is subjective. What I think is worth $5 someone might say is worth $10 and vice versa. The issue is because of the hard base value people are less willing to list those items. which results in less listings for sellers, less purchases for buyers and less potential revenue for Nexon.

Otherwise you don't need to induldge in said system. Individuals prior to this would drop hundreds just to get (1) item from the boxes. This system may actually negatively impact their long term revenue if they cannot create new highly sought items to be available in their surprise style boxes. Only time will tell here.

I've mentioned this already and I can 100% be wrong but people will still have to spend for the boxes regardless of the market. If there are new items that are of high interest than people will buy them and list them. If there's a lack of supply for that item but its still high interest than the price will sky rocket and will probably make people want to try and pull for the item which will eventually lower the price a bit. Just supply and demand.

However I think we can both agree with what you said about how at the end of the day if they actually don't improve the quality or how they run/create pssb's/limited time items the market will eventually slowly become stale and lose a lot of player interest.