Why Does Hershey Add wax to keep chocolate from melting?

No but it certainly tastes that way, doesn't it? While there isn't wax, there is a significant amount of oil which aids in the waxy texture. Higher quality chocolate is made with cocoa butter which gives it a smooth texture. However, Hershey's doesn't use as much cocoa butter as the higher grade stuff because it's more expensive. (which is why the Lindt bars cost much more than the Hershey's bars.)