To answer your question on the ether forum:
Yes, i think it is because you have no website.

Better say: Why use some script from a forum if you can invest in the 'original' doubler @ ethereumpyramid.com
Which has already a increasing userbase and funds in the wallet.

Or has your contract some advantages?

Don't get me wrong, i like the idea and the fact that it's 'trustless'.
But without a real 'killer-feature' that seperate you from the other projects i don't see a future for it.

Maybe when the Bitcoin-Ether Bridge Technologie (like rootstock.io) is ready and it's possible to combine Smart Contracts and Bitcoin.