I realize this is a problem and have seen this info-graphic before, but it makes sense for power consolidate into a few hands. At a certain point the marginal cost of buying a few properties becomes lower for a group of people so they just buy. Meanwhile the small guys realize that they are better off it they get bought out (they realize they can't be a big guy) so they go with the best offer.
It sucks for 'us' consumers, but from the perspective of companies trying to make the most money possible, it makes perfect sense.