That’s one way to say you don’t understand how tires work

Sure the tires are expensive, but replacing a valve stem is only going to cost maybe about $50, if you call around a little you might even find somewhere that will do it for like $20.

Now if it’s not just a stem and has a tire pressure monitor, that gets a little pricey, that might be over $100. Most of those aren’t just a rubber stem but made out of metal, so not as easy to just “snip.” But usually it can still be replaced with a plain stem as long as they’re willing to ignore the light on their dash.