Adding a dollar to the coin sale is an idea, but it is halfway through April and no coin in the makes. And more than likely the $ backer of the coin, who ever it is is going to what their money investment back first. Which is understandable.
I again want to add,
If they don't want to give a donation, then they won't pay a membership.
If they'd agree to a membership, why not just donate $5.00.