Let's look at each one of those buyers: Alpha is in debt up to its eyeballs and has no money to spend. Townsquare has been rumored to be on the block, as it's main lender is pulling out, so they have no money to spend. Saga just had a rough quarter, and they don't have access to the kind of cash this would take. Curtis just bought a few small groups, and that pretty much maxes them out. They're a small family company.
And Summit just went through a financial restructuring when one of the investment bankers wanted to withdraw and a new stakeholder was found. It's a relatively small company, and not one likely to be able to absorb more than a market or two at a time if they were to expand.