+1 to putting a disclaimer when you invest. You can use any legal prospectus to find suitable language (Something like, "Bankrolling Just-Dice represents a speculative investment and involves a high degree of risk. An investor could lose all or a substantial portion of his/her investment.")

Suggestion: Stop calling it "investment". I think a better word could be "bankroll". This might help people lose the idea that this is some sort of Savings Account with FDIC insurance.