I'd focus more on the analytics than the affiliate revenues. Most bloggers I've spoken with on the topic say the visibility/analytics they have on their affiliate revenues is poor. Most affiliate programs will give you click data but beyond that you really have no idea what's being bought, what's driving your affiliate revenues, or the value of your visitors.

I had a blogger friend recently pitch a project to a luxury brand and one of the first things the brand asked for was ROI and purchase data on the blog. She could piecemeal some of it but it's a challenge.

On the flip side, advertisers/brands are asking for more ROI and conversion data to identify who is actually driving sales.