Is this making anyone else nervous?

[Bruce Parker (RIP)]

My wife makes most major purchases in cash (like our roof last summer for instance). It's not for any tangible reason other than to make the bank teller's heads explode. She enjoys that. Banks clearly are uncomfortable in chunks of cash much larger than a few hundred bucks.

Same wife got used to paying for gas at the pumps with a credit card. Easy peasy. Until the card bounced some other purchase for no apparent reason. Well there was a reason. Every time she bought gas it locked a hundred bucks on the card and kept it locked for a couple of days. Several back to back fill ups and the card was maxed out.