First of all, stop making reference to your bachelor thesis because it really doesn't prove anything except that you are mostly fond of convincing people you are correct rather than being so.
Second, your idea that claims must be spawned because of the gambling restrictions means that all types of loot must be pre-spawned. That would include all blueprints and mobs as well. I do believe that MA might have taken the laws into consideration, but not in the way you suppose.
E.g: Two players with various skill levels drop bombs. The more experience and knowledgable player will find more loot due to better gear, higher skills and a feel for the mining system. That should be enough to consider it skill-based.
On top of that, you actually do not loot anything. MA loots a lot of stuff and they let you play with their avatar. Whatever you find belongs to MA. Also, your idea should apply to all games because pretty much every large MMO gives players items that others are willing to pay real money for, therefore assigning them value.
Edit: To clarify, I am not saying you are wrong about the claims spawning like mobs. What I am saying is that your arguments for it are weak and that I myself do not believe in it.