From Myrtle Beaches Web Site:
"First of all, safety, making sure you can get through a wall of tents to get to the beach in the event of an emergency, making sure emergency responders can get there," said city spokesman Mark Kruea. "The fact that they take up a lot of real estate, more people could enjoy the beach with fewer tents out there. And then over the last five years, we've essentially added two million extra visitors, so there are more people trying to use the beach."
Horry County
**UPDATE APRIL 17, 2014***
Horry County - Ordinance 19-14
Council finds that the placement of tents on the beach have a detrimental effect upon the safety and welfare of users of the beach, by creating obstructions to the view of lifeguards, impediments to public safety access and response in situations of emergency, and obstacles to other beachgoers especially in areas of high use and limited beach area.