Like sibling post mentioned, you don't seem to be the target audience. I know a lot of people, friends and family, who constantly leave stuff behind, in restaurants, other people's places, on the train, in shops, you name it. 99% of the time, no one's gonna steal it, but trying to figure out where the hell you left something, if you do leave stuff behind often, becomes increasingly difficult. With something like an Airtag, it's no longer an issue. You get altered before you get too far, and even if you do, you can figure out later where your stuff is.

I once left my umbrella in a hire car. It took me 2 weeks to realize it was missing. Turns out no one touched it and I could see it on the map, in the parking lot of the hire car company. So I showed up, and within minutes, we pinned down which car it was in. Without Airtag, I would not even remember where I could have possibly left it, after two weeks! Learnt my lesson to turn on separation alert after that.

Now I need a smaller Airtag for my sunglasses — expensive and easy to leave behind.

Needing an Airtag is like needing a case for your phone. A lot of people keep dropping their phone so they put a case on it. In 13 years of owning a smart phone, I've never dropped mine. But I don't claim that phone cases are only useful if you throw your partner's phone off the balcony after a fight.