It may mean that you lack self-esteem and walk around looking at the ground. What's the use of finding a dime when you could lift your head, take in the sunlight and your surroundings, and have a million-dollar day?
I would like to think that someone you knew, who has passed on, is letting you know that they are with you and watching over you. Many times it is pennies, butterflies, feathers, for you it is dimes. Pay attention and you will likely see more. Know you were and are still loved. It is a good thing.
Me, personally, finding dimes does not mean I have low self-esteem and walk around looking to the ground, it doesn't mean to give me an "ooooo, WOW", it doesn't mean now I'm $.10 richer. I've never, ever found money, not even a penny, but since my son passed away, I now have a pouch full of dimes!!! Each one makes me think of him, and that's what counts. I will one day give this money to charity.