No, your average home tv is not designed to run 24/7. These Digital Signage Monitors are supposed to do this. Try running your average costumer tv 24/7 for half a year and see how the color & sharpness is. Also they are repairable (normally).
To offer a non-walmart option, I've been using the Rtings table tool to find consumer TVs are potentially more respectful of privacy. Although I get the impression a number of sets aren't captured here (maybe walmart has some listed that Rtings doesn't), they are fairly thorough.
You could say "I'm not installing software updates" and be safe from ads as long as you don't need any bugfixes, but then you're also missing out on security updates. If you keep it off the internet maybe you're ok, but your TV might start connecting to a neighbor's wifi to give you more advertising.
I worked at a company that was attempting to sell software to consumer electronics manufacturers as per the divx model - some of us remember when you couldn't buy a dvd player without that logo. But when streaming began to replace physical media, I was told that services such as Amazon and Netflix began paying to have their software in the devices. I'm curious whether that's still a revenue source for manufacturers.