I think there is a site in the UK called eToro where you can do this. I'm not sure if that's what they do, but it's something along those lines. Either way, it

I think there is a site in the UK called eToro where you can do this. I'm not sure if that's what they do, but it's something along those lines. Either way, it's a good idea. You might run into regulatory issues but I'm sure it would find a market