The Up Your Budget blog-based scavenger hunt is an interesting case in point (see my last). BL Ochman and Hugh Macleod are both involved, so it’s got some serious blogerati juju going for it. It’s all blog-based, including 100% of the ad buys. And just about every marketing-oriented blog is talking about it.

In pure terms of "experiential marketing" – this thing’s got it going. It has loads of user interaction, puts the customer in the forefront by sharing their pictures and stories, has near-realtime updates, is very blogabble (link-friendly in the link-happy blogosphere) and so on. Sweet.

But I ask – what does this do for Budget? How is this building affinity for their brand? Or increase the likelihood of all these competitors picking Budget next time they need a 4-door midsize? There’s very little in here that has anything to do with renting cars, or the underlying story about how Budget’s experience is remarkable.

Again, props to BL, Hugh, et al for a very cool viral blog-based marketing effort for a big-name client. As a marketing stunt leveraging blogs, this is a pioneering effort and strong on execution to date. I would just love to understand the underlying ROI as defined by Budget.