Someone else interested?
Nope.
Since I also happen to know the "trustworthy dicesite Y", there are certain issues with your offer:
1. However trustworthy Y may be, Y getting hacked is a possibility that you cannot simply rule out. Too many examples of trusted sites going out because of hackers. Just look around..
2. Theoretically, it is better for the lender to simply invest it himself.
If he is unwilling to carry the risk, he invests, sends the profit/receives the loss, and you give the interest. Only such kind of trustworthiness is raarely found.
3. It has a lot of hassles and practically very difficult to implement. The carelessness of a single party can affect everyone else quite severely.
Just what I think
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