I really like your concept! - I think it will work, but I believe you will have more success if you have a sense of playfulness in your logo, so I hope you like my concept!
Hi, I've submitted 2 new versions to fill the space:
1. With gold coins (gets across your $1 at a time idea).
2. Have you considered using your text (Help make me rich, one dollar at a time. Have you ever thought to yourself, what if I had a dollar from everyone?) in a larger / bold font? This could run directly underneath the logo, filling the space plus also getting your point across quicker.
I really liked the addition of the coins. The text however not. The current text that is on my website is temporary. I have contracted with a writing company to give me something better.