I suppose we are viewing this from two very different perspectives.
This idea of getting people to promise to donate some money if someone achieves their pledge might make sense in terms of getting people who already know and daily visit the site to participate.. but i tend to think of those people as already being friendly to the concept of supporting DC with donations, and not needing much of an incentive.
To my mind, the more important thing during the fundraiser is to try to reach out to those people who either have never visited the site, or else have visited once or twice to download some program, but have never donated and haven't given it a real thought.
So from my perspective, the most important thing we can do for the fundraiser, other than appealing to long time members to donate again, is to reach these other people by showing them that we create useful content that they benefit from, and by having other people spread the word about the useful content we create.
That's why my focus has been to be able to have some events during march that will get people's attention and show them the kinds of things we do that they might like to support. Hence the idea of having a new coding snack or mini review released every day during march.
What I'd really like to be able to do is spread the word to other website that sometimes write about DC and say: "please tell your readers to drop by and pay us a visit throughout march as we will have new things every day that you may be interested in" and "consider making a donation if you like what we do".
The fundraiser is an opportunity for us to show why we are useful and why people should support the site.