"100 billion total Ripples (XRP) with all of them "pre-mined," as Ripple is not a cryptocurrency.
Ripple Labs possesses some 50 billion Ripples in hopes they will increase in value."

The above is a review from Heavy.com.

My opinion is that Ripple doesn't contain the key element, mining. If the entire community doesn't feel engaged, then Ripple is not generating interest or market value.