Concealed carry is not banned from the Waffle House in Clemson, SC. Even if their corporate office thinks it is... it isn't.
Uh, that's not the point. The same applied to many of the Applebee's restaurants in TX (we have a VERY specific law regarding posting), but they were threatened with a boycott anyway. The simple reason is that you shouldn't support a business that doesn't want you to defend yourself, even if they are stupid or careless in how they implement that policy. There are lots of other places to eat or shop, and companies like this need to be reminded of it.
Another thing that you need to consider is that the mere fact of such a posting - legally binding or not - makes it far more likely that some miscreant and his demented pals will walk in with a bunch of their own guns to rob the place and its patrons, simply because they don't think that any of you are armed - courtesy of the GFWs (Gun-Fearing Wussies, from Kim DuToit's website) at corporate HQ. So, regardless of whether you personally are able to legally carry there or not, and whether you do, in fact, carry there, such a policy places you (and every other patron and all of the employees) at greater risk.
No, there's no debate: businesses that can't respect my right to self defense WILL NOT get my dollars. They deserve to go out of business, just as if they posted a sign that said "No Blacks or dogs allowed." The principle is EXACTLY the same. If YOU, a CCH holder, won't defend your own right to self defense, WHO WILL? What's to stop the next business, and the next, and the next, etc. from similarly posting (and eventually they'll all get the signage correct)? Go ahead, don't boycott: you can expect the value of your CCH to decline over time.
Nothing personal, but your statement reeks of "I've got mine, so who cares about anyone else." Maybe you aren't thinking things through; I hope that this post helps a bit.