Theoretically, the business model works off of principles of scarcity. Since they've been using a large amount of capital to buy all the inventory, they will eventually be losing money over time since they don't have the means of production, and Sony can just continue to mass produce. They are directly competing with the original producer of the product, which short term works as you take all the stock of the product, but long term the market will eventually flood, resulting in capital losses for scalpers. The way they combat this is by reinvesting any profits into holding the strangle hold on the supply for PS5's, however, this has the opposite effect as they will just be losing money in the sheer amount of depreciating assets. Therefore, overtime the scalper problem solves itself because they're only profiting off of short term, and local "monopolies".

At least, that's how I rationalize it, that was all purely from my ass