Basically, you built a frame around Google search that, if utilized by your users, will pay you rather handsomely. While the idea isn't all that bad, i have a personal issue with the way you concealed it and practically trick the user into utilizing Google Search.
The site is designed to draw the user into the search box, without explanation of its intent - while the design satisfies the task, the underlying ethical/disclosure issue doesn't go away.
In regards to the overall design, the site doesn't offer anything ground breaking or innovative, you're lacking the very basics such as a logo and favicon.
In order to call it as i see it - it's a scheme to get users to use google search in an effort that you get paid.
On my scale, that makes your site a -10.
Others may not share my opinion on this subject, maybe you'll get a more favorable review from them.
M.