Most of you shouldn't be donating to WMF in the first place; they don't need your money. You could reasonably cancel your donation without resolving any of the mission vs. labor conflicts indicated by this post.
Just piling in to this because it needs to be stated with emphasis. Wikipedia foundation is not Wikipedia. Their donation campaigns are highly deceptive. Pennies on the dollar will go to supporting and maintaining the actual encyclopedia. WMF is as much a liability to the encyclopedia as a beneficiary.
I have different reasoning than the parent commenter. Why do you want to help fund Wikipedia? It is in no danger at all. Funding it even more lavishly probably won't help it achieve its goals more effectively; it's dependent (by design, and for good reason) on volunteer effort, which is the real bottleneck.
I feel like my Wikipedia-boosting bona fides are pretty solid on HN. I think it's not just a very valuable resource but also one of the great intellectual achievements of the last 100 years. My point isn't that the project is unworthy; it's that they don't need your money.
If you want to help Wikipedia, the best thing you can do is contribute to articles. Time and expertise is always going to be a more valuable donation than anything monentary.