Lol I just replied to the tire thread the second you replied here.
This thing would probably cost less than those tires! About the price of one or less!
It would appear there is some sort of market for gauging lean after all. I know for sure there's a market for a cheap easy shift gauge too.
Also, this lean gauge can be adjustable to where it knows how far your bike can lean before something hits. Those tires can't.