I had the idea

I had the idea to start a special service, but I need to know your opinion first or some ideas to extend it:
The idea is something like a bank: you give me money, I 'invest'(merchant) it and you'll get a certain amount of % extra every day/week. When you think you have enough you can request payout and I'll give the money. I think I'll make a nice site for this that keeps track of everything. But I think it's a bit too trusted, what do you guys think?

please don't flame if you think this idea is stupid, just say why it's stupid and what I could do to improve it

 

you'll definetly need people to trust you.

 

good luck getting people to trust you.

 

Anyone has tips how I can gain trust?(maybe like 100k at a time first or something)

 

No one is even going to care for interest on 100k anyways, its what, 5k?

And I dont see how you would make money off this, or there would be no point.

 

I probably earn more than 10% of the money invested in 1 week, so if I give the investor something like 5% I still earn money

 

Maybe stay on the site for another year and get about 500 posts, then we'll see.