We've all had to do it, show ID when checking out some very mundane items like a Sharpie or fuel cleaner or over the counter medication. Baking may be next. I look at why and other weird items that require an ID inside.
Of course, it doesn't matter how much money you make if you are hell-bent on spending every last penny without paying yourself first. Even more detrimental is spending money you don't truly have in the bank.
I can't tell you how many stories we've heard about people getting 'rich people' jobs, getting an inheritance, or even winning the freaking lottery who end up practically broke because of poor personal money management.