Yes.
I don't have a 10-second rule, per se. But I think pretty hard about any purchase, no matter how large or small.
When I lived on a tight budget, I just learned to ask myself, "Will I really use it?" "How long until I am bored of it?" etc., etc. It's a good habit I don't plan to outgrow.
It's probably akin to the 10-second rule.
I OFTEN think if I really want something, I will go back and get it later. Odds are it will lose its appeal in the meantime. A "day rule" is really good to have. But that's for the stuff I am more on the fence about.