Interestingly enough my boyfriend and I practice a form of "fun" by leaving small change hidden in places where kids would most likely look hee
Remember the glee and joy when you were little and found some spare change???
Just the other day I left four quarters at the bus stop wedged into the arms of a iron/wood bus bench. Seriously only a child-like mind would notice
them as they blended in with the bench really well.
My fun comes in going back to the bench and seeing if they're gone
I don't really care if it was a kiddo that found them or someone down on their luck or even just a curious minded person who takes in their total
My point is, rather than focus on "why" focus on the kid in you that reacts to the find with simple glee and a smile
If it is a paranormal "sign" I'd gather that this would be the intention...just enjoy.
I also leave stickers, dimes and other items in places where most likely a kiddo would find them (or as I said, a child-like mind).
Stay young in heart and mind...why not try it yourself with all your found dimes??