Wouldn't that be a chillul hashem? Or do they expect people not to buy?
They know most people come for the vacation and don't buy but if 10 - 15 couples do it together is can be a a little bit of an issue
Just some other ideas: Atlantic City (Plenty of non gambling family activities in the area), Lake George (Mostly mom & Pop hotels though), There is a catagory 3 SPG across the street from Sesame Place in Langhorne, PA if most people have small kids.