I think it's a cool idea with some potential
The site will also be monetized with ads. The profits of which will go towards purchasing more coins to offer more contracts.
Think you'll generate enough traffic to pay the interest? You probably will anyway. I just worry that if I sign up and deposit some coins, you'll get just 2 chances to show me ads, 60 days apart. I might drop by more often if this was coupled with something else interesting: games, articles, commentary, a trollbox at the very least

Well, with a real-time ticker, people may tend to often keep a tab open at this site to look at their money stash grow ^^
... not that all people do that ... but did you never stayed for at least minutes looking at your miner ?

Great points and exactly my thinking! Of course not everyone will keep an eye on it but I am sure a lot will... I know I would and yes I have sat staring at my miner many a time, as well as the pool data lol