Chips don’t just warp on their own like cards can. If chips are warped they were either warped due to faulty manufacturing, for else somethibg stupid happened to them like being left on the dashboard of a hot car. And a lot of people have posted here having success un-warping chips by clamping them together and baking them at low temperatures.
Anyway, how’s it affect playability? Depending on how bad the warp is, it will affect how well the chips will stack. But not really. Most people keep their stacks to 20 and a couple of warped chips isn’t going to mess that up for otherwise high quality chips.
Value? Yes it can affect that. If you get a good look at a rack of chips, you’ll notice the warped ones, and you won’t want to pay as much.
So warped chips aren’t ideal, but they’re not that big a deal either, unless the problem is severe.