Townsquare is selling things beyond the air signal, and that gives them a leg up. Entercom's rights to their most valuable products are limited to the air signal.
This is very true. When you listen to an Entercom Buffalo stream you hear promos on how "Internet Radio Works", followed by a 5-minute long stream of long-outdated "Stamp Reports", Johns Hopkins PSAs and "Looking At The Law" vignettes. Makes me want to call an AE and buy time.