You could bend the neck a million times and never have a problem, you could bend it once and snap it right off, no gurantees either way, probaly what will happen if you keep doing it, is that you'll make the neck/body joint loose, and thats a major repair on a set neck guitar like a Les Paul, but it's your choice, I'm not telling you it's right or wrong, just don't go in shock if you ever hear a loud cracking noise followed by a sharp pain in the wallet!