This seems like an investment risk more than a scam.
His "coin" is similar to ripple, whoever buys in will probably know the risk of a single-minted close-source altcoin. Let it be.
He's asking for money before anything has actually been created. Ripple gave out free ripples and let people voluntarily assign them value.
This is nothing like ripple. It's a scam. It's not a "risky investment" it's him asking for cash money right now in exchange for promises of future money. It's a nigerian prince scheme masquerading as an alt-coin.