Mathematically speaking, the probability of you winning is not influenced by how many nodes any one other person possesses, only by 1. how many nodes you possess and 2. how many nodes exist in total. You are not more-or-less likely to win if the rest of the nodes are owned by different individuals or all by the owner. This is not a problem. Gamblers who don’t know the basics of probability/statistics/combinatorics think it is, but it is not.
FYI: If the HyperNet auctioneer bids a pricy item and loses, he’s ■■■■■■. I’ve done the combinatorial analysis already… it’s… not… that… profitable in the long run… with the hypercore prices and hypernet taxes as high as they are… and if you fail a single auction (or even let one expire), you’re sunk