3. The aim will be 15% ROI. I will keep 5% of this and send 10% to you (you make 110% on your deposit).
The big question here is.
If you can make 15% ROI why not bankroll yourself and keep the full 15% rather than split it with others?
A consistent 15% compounding interest accrues
a lot of value over time. There are studies which conclude that many successful and wealthy stock market traders only manage to earn 15% ROI
per year on their investments. If you had a "magic script" which could mirror those types of metrics, why not keep it to yourself? And better yet, why announce it publicly where admins of sites like bustadice.com might become aware of it, and patch whatever advantage your script hopes to leverage?
Also I might announce something similar in the future. Although my plan will address some of the questions which your post raises and hopefully answer them in a way which might satisfy skepticism.

Good questions.
I am doing this for two main reasons:
1) To be altruistic and distribute profits to users
2) To redeem my broken reputation
A secondary reason includes the fact that I would not like to risk my funds on this, since I am not rich, and losing even 0.01 BTC will be quite a hard blow for me.
Also, I forgot to mention in the OP: each 1% takes 3 mins 40 seconds, so 10% would take ~40 minutes, and so on.
Oh, and it's not magic. It's calculated risk.