Probably one of the neatest ideas i've seen in a while. Also the biggest time waster i've seen in a while. Honestly, congrats for coming up with this, but who in their right mind is going to check 300k pixels to find ONE pixel that's clickable, especially when there's nothing to win!
I didn't bother to chase after it, 'cause after 2 minutes i got beyond annoyed with it, that may just be a general issue of patience, though.
My recommendation would be to offer some prices, reward them for their endless search. In addition, the ONE pixel that is clickable, what does it do?
Neat idea that needs better verbal presentation and a bit more of a business/marketing concept behind it.