This is highly dependent on what your site does. If you could somehow get that much traffic on a blog, the cost of bandwidth and servers would be very low (tens

This is highly dependent on what your site does. If you could somehow get that much traffic on a blog, the cost of bandwidth and servers would be very low (tens of thousands at the most, say 5% of your revenues). On the other hand, if every page view is extremely heavy with a long tail of uncacheable content (e.g. Youtube) or computationally expensive (web search engine), then bandwidth and servers become a significant percentage of the revenues.