Can't you just lie about your data?
We call that "weaseling," and sure, you could. But if you were the type who would falsify your data to weasel out of paying what you pledged on your yellow brick road, then you probably would’ve rolled your eyes and closed this tab before reaching this page.
We've written a few blog posts about weasels in the past: 1 2 3. Ultimately, there's no benefit to anyone in beeminding something if you're not going to be honest about it: you don't achieve what you were trying to, and Beeminder doesn't make money. If it's not working for you, that's quite all right - you can adjust the goal to make it easier, or archive it to walk away entirely just 7 days later.